IMPOSTER (the movie) ending

can someone please explain the ending of The Imposter to me, i just saw it and i have no idea what went on in the end, thanks in advance

And they lived happily ever after....

The Imposter eh?
Bet it turned out that Chrisjk was responsible for all of them!! :D

i'm going to have to spank your botty beachnut

tennisman was responsible for more imposters than I was.

so who exactly were you?
not numbers, names.

I posted a list a while ago, I've made no new ones since