diff --git a/src/activity_pub/activity.rs b/src/activity_pub/activity.rs
index 6ffb0540..6e0b47c0 100644
--- a/src/activity_pub/activity.rs
+++ b/src/activity_pub/activity.rs
@@ -1,69 +1,150 @@
 use chrono;
 use diesel::PgConnection;
 use serde_json;
+use std::str::FromStr;
 
 use activity_pub::actor::Actor;
 use activity_pub::object::Object;
 
-#[derive(Clone)]
-pub enum Activity {
-    Create(Payload),
-    Accept(Payload),
-    Follow(Payload)
+pub trait Activity: ActivityClone {
+    fn get_id(&self) -> String;
+
+    fn serialize(&self) -> serde_json::Value;
+
+    // fn deserialize(serde_json::Value) -> Self;
 }
-impl Activity {
-    pub fn serialize(&self) -> serde_json::Value {
-        json!({
-            "type": self.get_type(),
-            "actor": self.payload().by,
-            "object": self.payload().object,
-            "published": self.payload().date.to_rfc3339()
-        })
-    }
 
-    pub fn get_type(&self) -> String {
-        match self {
-            Activity::Accept(_) => String::from("Accept"),
-            Activity::Create(_) => String::from("Create"),
-            Activity::Follow(_) => String::from("Follow")
-        }
-    }
+trait ActivityClone {
+    fn clone_box(&self) -> Box<Activity>;
+}
 
-    pub fn payload(&self) -> Payload {
-        match self {
-            Activity::Accept(p) => p.clone(),
-            Activity::Create(p) => p.clone(),
-            Activity::Follow(p) => p.clone()
-        }
+impl<T> ActivityClone for T
+where
+    T: 'static + Activity + Clone,
+{
+    fn clone_box(&self) -> Box<Activity> {
+        Box::new(self.clone())
     }
+}
 
-    pub fn create<T: Object, U: Actor>(by: &U, obj: T, conn: &PgConnection) -> Activity {
-        Activity::Create(Payload::new(serde_json::Value::String(by.compute_id(conn)), obj.serialize(conn)))
-    }
-
-    pub fn accept<A: Actor>(by: &A, what: String, conn: &PgConnection) -> Activity {
-        Activity::Accept(Payload::new(serde_json::Value::String(by.compute_id(conn)), serde_json::Value::String(what)))
-    }
-
-    pub fn follow<A: Actor, B: Actor>(by: &A, obj: &B, conn: &PgConnection) -> Activity {
-        Activity::Follow(Payload::new(serde_json::Value::String(by.compute_id(conn)), serde_json::Value::String(obj.compute_id(conn))))
+// We can now implement Clone manually by forwarding to clone_box.
+impl Clone for Box<Activity> {
+    fn clone(&self) -> Box<Activity> {
+        self.clone_box()
     }
 }
 
 #[derive(Clone)]
-pub struct Payload {
-    by: serde_json::Value,
+pub struct Accept {
+    id: String,
+    actor: serde_json::Value,
     object: serde_json::Value,
     date: chrono::DateTime<chrono::Utc>
 }
 
-impl Payload {
-    pub fn new(by: serde_json::Value, obj: serde_json::Value) -> Payload {
-        Payload {
-            by: by,
-            object: obj,
+impl Accept {
+    pub fn new<A: Activity, B: Actor>(who: &B, what: &A, conn: &PgConnection) -> Accept {
+        Accept {
+            id: "TODO".to_string(),
+            actor: serde_json::Value::String(who.compute_id(conn)),
+            object: serde_json::Value::String(what.get_id()),
             date: chrono::Utc::now()
         }
     }
 }
 
+impl Activity for Accept {
+    fn get_id(&self) -> String {
+        self.id.clone()
+    }
+
+    fn serialize(&self) -> serde_json::Value {
+        json!({
+            "type": "Accept",
+            "actor": self.actor,
+            "object": self.object,
+            "published": self.date.to_rfc3339()
+        })
+    }
+}
+
+#[derive(Clone)]
+pub struct Create {
+    id: String,
+    actor: serde_json::Value,
+    object: serde_json::Value,
+    date: chrono::DateTime<chrono::Utc>
+}
+
+impl Create {
+    pub fn new<A: Actor, B: Object>(actor: &A, obj: &B, conn: &PgConnection) -> Create {
+        Create {
+            id: "TODO".to_string(),
+            actor: serde_json::Value::String(actor.compute_id(conn)),
+            object: obj.serialize(conn),
+            date: chrono::Utc::now()
+        }
+    }
+}
+
+impl Activity for Create {
+    fn get_id(&self) -> String {
+        self.id.clone()
+    }
+
+    fn serialize(&self) -> serde_json::Value {
+        json!({
+            "type": "Create",
+            "actor": self.actor,
+            "object": self.object,
+            "published": self.date.to_rfc3339()
+        })
+    }
+}
+
+#[derive(Clone)]
+pub struct Follow {
+    id: String,
+    actor: serde_json::Value,
+    object: serde_json::Value,
+    date: chrono::DateTime<chrono::Utc>
+}
+
+impl Follow {
+    pub fn new<A: Actor, B: Actor>(follower: &A, following: &B, conn: &PgConnection) -> Follow {
+        Follow {
+            id: "TODO".to_string(),
+            actor: serde_json::Value::String(follower.compute_id(conn)),
+            object: serde_json::Value::String(following.compute_id(conn)),
+            date: chrono::Utc::now()
+        }
+    }
+
+    pub fn deserialize(json: serde_json::Value) -> Follow {
+        Follow {
+            id: json["id"].as_str().unwrap().to_string(),
+            actor: json["actor"].clone(),
+            object: json["object"].clone(),
+            date: chrono::DateTime::from_str(json["published"].as_str().unwrap()).unwrap()
+        }
+    }
+
+    pub fn get_target_id(&self) -> String {
+        self.object.as_str().unwrap().to_string()
+    }
+}
+
+impl Activity for Follow {
+    fn get_id(&self) -> String {
+        self.id.clone()
+    }
+
+    fn serialize(&self) -> serde_json::Value {
+        json!({
+            "type": "Follow",
+            "actor": self.actor,
+            "object": self.object,
+            "published": self.date.to_rfc3339()
+        })
+    }
+}
diff --git a/src/activity_pub/actor.rs b/src/activity_pub/actor.rs
index 192d190d..75e05c9f 100644
--- a/src/activity_pub/actor.rs
+++ b/src/activity_pub/actor.rs
@@ -67,7 +67,7 @@ pub trait Actor: Sized {
         ))
     }
 
-    fn send_to_inbox(&self, conn: &PgConnection, act: Activity) {
+    fn send_to_inbox<A: Activity>(&self, conn: &PgConnection, act: A) {
         let res = Client::new()
             .post(&self.compute_inbox(conn)[..])
             .body(act.serialize().to_string())
diff --git a/src/activity_pub/inbox.rs b/src/activity_pub/inbox.rs
index fd125be5..e1971372 100644
--- a/src/activity_pub/inbox.rs
+++ b/src/activity_pub/inbox.rs
@@ -1,7 +1,7 @@
 use diesel::PgConnection;
 use serde_json;
 
-use activity_pub::activity::Activity;
+use activity_pub::activity;
 use activity_pub::actor::Actor;
 use models::blogs::Blog;
 use models::follows::{Follow, NewFollow};
@@ -29,13 +29,13 @@ pub trait Inbox: Actor + Sized {
                 }
             },
             "Follow" => {
-                let follow_id = act["object"].as_str().unwrap().to_string();
+                let follow_act = activity::Follow::deserialize(act.clone());
                 let from = User::from_url(conn, act["actor"].as_str().unwrap().to_string()).unwrap();
                 match User::from_url(conn, act["object"].as_str().unwrap().to_string()) {
-                    Some(u) => self.accept_follow(conn, &from, &u, follow_id, from.id, u.id),
+                    Some(u) => self.accept_follow(conn, &from, &u, &follow_act, from.id, u.id),
                     None => {
-                        let blog = Blog::from_url(conn, follow_id.clone()).unwrap();
-                        self.accept_follow(conn, &from, &blog, follow_id, from.id, blog.id)
+                        let blog = Blog::from_url(conn, follow_act.get_target_id()).unwrap();
+                        self.accept_follow(conn, &from, &blog, &follow_act, from.id, blog.id)
                     }
                 };
                 
@@ -45,13 +45,13 @@ pub trait Inbox: Actor + Sized {
         }
     }
 
-    fn accept_follow<A: Actor, B: Actor>(&self, conn: &PgConnection, from: &A, target: &B, follow_id: String, from_id: i32, target_id: i32) {
+    fn accept_follow<A: Actor, B: Actor, T: activity::Activity>(&self, conn: &PgConnection, from: &A, target: &B, follow: &T, from_id: i32, target_id: i32) {
         Follow::insert(conn, NewFollow {
             follower_id: from_id,
             following_id: target_id
         });
 
-        let accept = Activity::accept(target, follow_id, conn);
+        let accept = activity::Accept::new(target, follow, conn);
         from.send_to_inbox(conn, accept)
     }
 }
diff --git a/src/activity_pub/outbox.rs b/src/activity_pub/outbox.rs
index 82558683..9aa891d8 100644
--- a/src/activity_pub/outbox.rs
+++ b/src/activity_pub/outbox.rs
@@ -9,13 +9,13 @@ use activity_pub::activity::Activity;
 use activity_pub::actor::Actor;
 use models::users::User;
 
-pub struct Outbox {
+pub struct Outbox<A> where A: Activity + Clone {
     id: String,
-    items: Vec<Activity>
+    items: Vec<Box<A>>
 }
 
-impl Outbox {
-    pub fn new(id: String, items: Vec<Activity>) -> Outbox {
+impl<A: Activity + Clone + 'static> Outbox<A> {
+    pub fn new(id: String, items: Vec<Box<A>>) -> Outbox<A> {
         Outbox {
             id: id,
             items: items
@@ -23,24 +23,24 @@ impl Outbox {
     }
 
     fn serialize(&self) -> ActivityPub {
-        let items = self.items.clone();
+        let items = self.items.clone().into_iter().map(|i| i.serialize()).collect::<Vec<serde_json::Value>>();
         activity_pub(json!({
             "@context": context(),
             "type": "OrderedCollection",
             "id": self.id,
             "totalItems": items.len(),
-            "orderedItems": items.into_iter().map(|i| i.serialize()).collect::<Vec<serde_json::Value>>()
+            "orderedItems": items
         }))
     }
 }
 
-impl<'r> Responder<'r> for Outbox {
+impl<'r, A: Activity + Clone + 'static> Responder<'r> for Outbox<A> {
     fn respond_to(self, request: &Request) -> Result<Response<'r>, Status> {
         self.serialize().respond_to(request)
     }
 }
 
-pub fn broadcast(conn: &PgConnection, act: Activity, to: Vec<User>) {
+pub fn broadcast<A: Activity + Clone>(conn: &PgConnection, act: A, to: Vec<User>) {
     for user in to {
         user.send_to_inbox(conn, act.clone()); // TODO: run it in Sidekiq or something like that
     }
diff --git a/src/models/blogs.rs b/src/models/blogs.rs
index 06f57e21..0957c43d 100644
--- a/src/models/blogs.rs
+++ b/src/models/blogs.rs
@@ -78,11 +78,11 @@ impl Blog {
         }
     }
 
-    pub fn outbox(&self, conn: &PgConnection) -> Outbox {
+    pub fn outbox<A: Activity + Clone + 'static>(&self, conn: &PgConnection) -> Outbox<A> {
         Outbox::new(self.compute_outbox(conn), self.get_activities(conn))
     }
 
-    fn get_activities(&self, _conn: &PgConnection) -> Vec<Activity> {
+    fn get_activities<A: Activity + Clone>(&self, _conn: &PgConnection) -> Vec<Box<A>> {
         vec![]
     }
 }
diff --git a/src/models/users.rs b/src/models/users.rs
index 9bfcf7da..8a57ac9b 100644
--- a/src/models/users.rs
+++ b/src/models/users.rs
@@ -11,7 +11,7 @@ use serde_json;
 use url::Url;
 
 use BASE_URL;
-use activity_pub::activity::Activity;
+use activity_pub::activity::{Create, Activity};
 use activity_pub::actor::{ActorType, Actor};
 use activity_pub::inbox::Inbox;
 use activity_pub::outbox::Outbox;
@@ -184,16 +184,16 @@ impl User {
         }
     }
 
-    pub fn outbox(&self, conn: &PgConnection) -> Outbox {
+    pub fn outbox<A: Activity + Clone + 'static>(&self, conn: &PgConnection) -> Outbox<A> {
         Outbox::new(self.compute_outbox(conn), self.get_activities(conn))
     }
 
-    fn get_activities(&self, conn: &PgConnection) -> Vec<Activity> {
+    fn get_activities<A: Activity>(&self, conn: &PgConnection) -> Vec<Box<A>> {
         use schema::posts;
         use schema::post_authors;
         let posts_by_self = PostAuthor::belonging_to(self).select(post_authors::post_id);
         let posts = posts::table.filter(posts::id.eq(any(posts_by_self))).load::<Post>(conn).unwrap();
-        posts.into_iter().map(|p| Activity::create(self, p, conn)).collect::<Vec<Activity>>()
+        posts.into_iter().map(|p| Box::new(Create::new(self, &p, conn)) as Box<A>).collect::<Vec<Box<A>>>()
     }
 
     pub fn get_followers(&self, conn: &PgConnection) -> Vec<User> {
diff --git a/src/routes/blogs.rs b/src/routes/blogs.rs
index ace2597b..4bc619b7 100644
--- a/src/routes/blogs.rs
+++ b/src/routes/blogs.rs
@@ -4,6 +4,7 @@ use rocket_contrib::Template;
 use std::collections::HashMap;
 
 use activity_pub::ActivityPub;
+use activity_pub::activity::Activity;
 use activity_pub::actor::Actor;
 use activity_pub::outbox::Outbox;
 use db_conn::DbConn;
@@ -57,7 +58,7 @@ fn create(conn: DbConn, data: Form<NewBlogForm>, user: User) -> Redirect {
 }
 
 #[get("/~/<name>/outbox")]
-fn outbox(name: String, conn: DbConn) -> Outbox {
+fn outbox<A: Activity + Clone + 'static>(name: String, conn: DbConn) -> Outbox<A> {
     let blog = Blog::find_by_actor_id(&*conn, name).unwrap();
     blog.outbox(&*conn)
 }
diff --git a/src/routes/posts.rs b/src/routes/posts.rs
index 6c571c82..9c2ad4d8 100644
--- a/src/routes/posts.rs
+++ b/src/routes/posts.rs
@@ -4,7 +4,7 @@ use rocket::response::Redirect;
 use rocket_contrib::Template;
 use std::collections::HashMap;
 
-use activity_pub::activity::Activity;
+use activity_pub::activity::Create;
 use activity_pub::outbox::broadcast;
 use db_conn::DbConn;
 use models::blogs::*;
@@ -55,7 +55,7 @@ fn create(blog_name: String, data: Form<NewPostForm>, user: User, conn: DbConn)
         author_id: user.id
     });
 
-    let act = Activity::create(&user, post, &*conn);
+    let act = Create::new(&user, &post, &*conn);
     broadcast(&*conn, act, user.get_followers(&*conn));
 
     Redirect::to(format!("/~/{}/{}", blog_name, slug).as_str())
diff --git a/src/routes/user.rs b/src/routes/user.rs
index 79e5de02..08cf2fca 100644
--- a/src/routes/user.rs
+++ b/src/routes/user.rs
@@ -5,7 +5,7 @@ use serde_json;
 use std::collections::HashMap;
 
 use activity_pub::ActivityPub;
-use activity_pub::activity::Activity;
+use activity_pub::activity;
 use activity_pub::actor::Actor;
 use activity_pub::inbox::Inbox;
 use activity_pub::outbox::Outbox;
@@ -34,7 +34,7 @@ fn follow(name: String, conn: DbConn, user: User) -> Redirect {
         follower_id: user.id,
         following_id: target.id
     });
-    target.send_to_inbox(&*conn, Activity::follow(&user, &target, &*conn));
+    target.send_to_inbox(&*conn, activity::Follow::new(&user, &target, &*conn));
     Redirect::to(format!("/@/{}", name).as_ref())
 }