I won 5,000 US Airways dividend miles from Thanks Again’s facebook promotion. Thanks Again gives you miles for using a registered card at selected retailers. It doesn’t cost anything to participate, so definitely sign up your cards for free miles. Also look into the dinning program for your airline of choice and register your credit cards with them too. I don’t recommend changing your spending habits; the rewards are only about 3 miles per dollar, but it is a nice surprise to receive bonus miles for spending you were going to do.
It also shows that real people actually win things from facbook promos, but only participate with brands you know to avoid some major spam.