I have a webcam and noone to communicate with. On oovoo you have to already know somebody to talk.
read this post
You could try http://www.omegle.com
well can u help cause when i tried to use omegle my built in mac webcam won't work
There are various pages offering random chat functionality.
One example would be http://www.chatroulette.com
You can find a lot of them searching "chat roulette", "shuffle chat" or "random chat" via Google.
Just keep in mind that A LOT of them are not clean as in nudity, language and stuff