"S" and "B" are nicknames for the characters Serena and Blair, who are best friends on the CW show Gossip Girl.

Yes, he is one of the main characters from the show.

his characters name is Chuck Bass

Page Six is the celebrity gossip page of the New York Post newspaper.

No, Gossip Girl is not a real site. Gossip Girl and it's characters are a work of fiction, written about in the Gossip Girl series by Cecily von Ziegesar. Consequently because of the book and television series popularity, many fans have made their own Gossip Girl sites. But I'm sure that there are internet sites similar to Gossip Girl, which track 'it-girls and boys' and spread gossip and rumors, whether they be true or false.