Homestuck

What is this and why is it so awesome?
www.mspaintadventures.com/
Just found out about this webcomic/game/animation(?) website a couple days ago. To be honest I have no idea what is going on in the story, and looking into the log I am barely halfway into it. The story I have reached so far is that some game can control these characters' environment and world, and all of sudden a giant meteor strikes the planet. Imps dressed up as jesters and clowns are attacking and I'm in distopian future?
Can someone enlighten me?