Black Ops splitscreen online

Got Black Ops for PS3 earlier, but I'm just wondering,
I know I can play splitscreen online, but is there any way I can sign into my PSN account and my brother can log into his and we can play splitscreen together? I thought I could, but I can't seem to figure out how.

Thanks in advance

 

I dont think you can multi log on 1 ps3.

 

Ah, thanks.

 

Only on xbox.

<3

 

Above was my second guess

 

you cant on ps3 cause people will just boost there accounts cause net if free, you can however on xbox 360 cause they dont expect you to go buying a xbox live account just for the purpose of boosting

 

Yeah, you can't multi-log on one PS3.

 

That would be a nice feature if it wasn't going to be totally abused.