Save yourself some time and do not bother with the 111 Free Reward Points "Promotion" - as with most too-good-to-be true Mafia Wars Reward Point ads, it doesn't work. This is a scam designed to get you to send a script to your Facebook friends.
You don't get any RPs, and comments in the group indicate others had the same experience I did. (If anyone had success getting RPs, let us know!).
There IS, however, an easy way to get ONE free Reward Point, as one of our commentors noted: Watch the Windows Phone video at the bottom of the Mafia Wars - Marketplace screen (nothing to buy, nothing to sign up for, you just have to hit "Like" on the phone and watch a 2-minute video).