You get the 50$ from one of the most reliable poker sites around, Poker Strategy
This site is considered to be one of the best "poker schools" and contains lectures, videos and lots of poker propesional content.
The site gives you 5 tries to answer a poker quiz after correctly answering the quiz you will get 50$ real money.
we give the answers to the poker quiz in this blog
You can choose to have the money transfered to either: PokerStars, FullTilt, 888.com, PartyPoker and more