Can you play ps2 games online with the ps3?

May be...

yes i think so you can

yes you can. however you must have a online connection disk for it. If you have the Madden 07 or 08, NCAA Football 07, 08 or NCAA March Madness 07 they come with it so you wont have to buy the start up disk. I'd just rent one of those games so you wont have to go out and buy one disk for just one time use.

yes i believe and even ps1 games i think HAVE FUN!!!