No you can not because they are on two different servers and platforms.
No. but you can play call of duty blacks online on a PC
Yes, Call of Duty: Black Ops will have online multiplayer just like many other Call of Duty video games.
You can play online in Call of Duty Black Ops PS3 using the online split-screen support.
Yes
yes it will.
you have to get it online.
You cant.
There is online for Call of Duty Black Ops Zombies.
No you need the same game to play against someone
Yes it is.
If you get call of duty black ops there is a zombie mode and you can play it online.(There are other call of duty's with zombie modes.)
Call of Duty Black Ops is four player split-screen, and 2 can play split-screen online.