ye
You save the profile.
Yes you can!
yes
You can play online in Call of Duty Black Ops PS3 using the online split-screen support.
Yes
Call of Duty Black Ops is four player split-screen, and 2 can play split-screen online.
Both.
yes you can
yes
WEEB
unfortunately it doesnt The PS3 and Xbox 360 do have online split screen
Yes, but you can't do Split Screen with the Wii.