That is a very good question. I would like to know that as well.
Especially how to set the right bid for a keyword. Do Facebook or MySpace have any software for you to predict the advertising effect like Google does?

Thanks

Facebook have a really targeted audience system i believe, you can specify exactly the type you like. With the amount of traffic that hits facebook everyday i cant see targeted ads failing ?

I'm not really a fan of facebook and myspace... they just don't give me enough traffic for my effort.

they are good, but I think facebook is better, because the system is easier to use and you have alot of options.

Is it very expensive to advertise on facebook?