User(user1): username: user1 password: user1 User(user2): username: user2 password: user2 follows : [user1] User(user3): username: user3 password: user3 follows: [user1, user2] User(user4): username: user4 password: user4 follows: [user1, user2, user3] Tweet(t1u1): msg: "Tweet 1 de user1" author : user1 date: 2011-01-01 Tweet(t2u1): msg: "Tweet 2 de user1" author : user2 date: 2011-01-02 Tweet(t1u2): msg: "Tweet 1 de user2" author : user2 date: 2011-02-01 Tweet(t2u2): msg: "Tweet 2 de user2" author : user2 date: 2011-02-02 Tweet(t3u2): msg: "Tweet 3 de user2" author : user2 date: 2011-02-03 Tweet(t1u3): msg: "Tweet 3 de user3" author : user3 date: 2011-03-01 Tweet(t2u3): msg: "Tweet 2 de user3" author : user3 date: 2011-03-02 Tweet(t1u4): msg: "Tweet 1 de user4" author : user4 date: 2011-04-01 Tweet(t2u4): msg: "Tweet 2 de user4" author : user4 date: 2011-04-02