I have started with facebook in nov 2009. But now, I can not live without facebook. Excellent for me...
I use facebook , ezdia aad twitter mostly in 2009. Facebook for networking and traffic , twitter for traffic , and ezdia for traffic , networking and business. So my vote is for all three
Interesting how FB gets the props, lots of traffic but.... “Facebook now has 350m users - and there's no point in advertising to them†guardian.co.uk/technology/2009/dec/06/facebook-350m-users-advertising