What if Dan is Gossip Girl?
I actually believe that Dan is directly or indirectly involved in the identity of GG. But he legitimately cannot be Gossip Girl if we look at the show as a whole.
I can't believe the wedding pictures with Chuck and Blair if Dan is GG. I mean why would they invite him if he really was the vilain all this time? Maybe the wedding is not real (God that would be awesome but let's be real here, the wedding will happen...)
Continuity wise it makes no sense for Dan to be GG. They'd have to be completely foolish to do it, even fans who like the idea couldn't look past all the instances where it makes no sense.
It wouldn't make a lick of sense, but then again you know that's this show's specialty.
Dan is probably GG. They will rewrite everything from the beginning. Let's wait and see...