Check this out, it's growing at a pretty fast rate.
Basically you sign up and find your friends already using the app... or invite some if no one you know is signed up. So you sign up and then you "Tune in" to media that you're watching. So tuning into TV and movies (theaters included, not just TV) earns you points. Those points can then be redeemed for real prizes like movie tickets and gift cards, etc. There's also a really cool competition feel to it.
It's fairly new and in the marketplace as ScreenTribe.
What do you guys think?
"Experience TV and Movies in a whole new way! See what your friends are watching or tune in to get points, badges, and even real life rewards. Find new shows and movies we know you'll love. Tune in on your mobile device or visit the website to earn points which can be redeemed for real life swag while having fun and enjoying your favorite shows and movies. All this and more when you join the Tribe! "