r u a gossip girl fan?

Know if u r a fan of gossip girl

1 what happens in the episode Pilot in season 1?
2 did Nate Archibald date Serena van der Woodsen before or after Blair?
3 In season 2 does Serena van der Woodsen find out who gossip girl really is at the beginning?
4 what season is it that the people in Gossip Girl are shown in their senior years?
5 is the role of Gossip Girl as important in season 1 than 2
6 who will be returning to the show in season 3?
7 who is Hilary Duff going to play?