Wow, do you understand how hard that is to find? Wow. I think i found out the right answer, but it might be wrong =/

I went to many websites, and couldn't find ONE thing. Then i went to GameFly for last hope. I looked to the online features and didn't see anything about online split screen. So i'm going to say there is no online split screen. And to be honest, i think Halo is the only game which that is possible =(