Plugin for beta key giveaway

I’m searching for a pluging to hold a beta key giveaway. I’m running a gaming website and from a developer, we received 200 CBT keys to hold a giveaway. I’ve been searching like crazy, but don’t find anything decent.

What I want to that users have to like our Facebook page or leave a Facebook comment, and then receive a beta key automatically.

Anyone knows something to achieve this?

Thanks in advance!