Conversation so far:
what is the truth between blair and dan
While things were strictly platonic between Blair and Dan in The End of the Affair?, Chuck and Louis are onto something.
What is the twist in Gossip Girl?
The titular Gossip Girl is later ultimately revealed in the television series finale to be Dan Humphrey.
Who is Blair Waldorf on Gossip Girl?
Blair Cornelia Bass is a main character in Gossip Girl, in which she is portrayed by Leighton Meester.
Who is Dan Humphrey on Gossip Girl?
Daniel Dan Randolph Humphrey is a main character in Gossip Girl where he is portrayed by Penn Badgley.

Question: When did the show end?
Self-contained rewrite: When was the series finale of Gossip Girl broadcast?