It's hard to believe that 10 years ago, Facebook was a brand new web site that most of us had never heard of. Today, there are more than 1.2 billion registered users (yes, that's "billion", with a "b").

On their 10th birthday today, they're the ones giving us a present.

You may have noticed some of your friends posting retrospective videos of their most popular photos, status updates, and posts and wondered how they put it together. Well, Facebook put it together for them, and you have one waiting for you, too.

All you have to do to see your "Look Back" is log in to your Facebook account, and go to http://www.facebook.com/lookback and voila, there it is!

It's a pretty cool way to look back on your Facebook history (and sometimes just a little embarrassing).

Enjoy, and happy birthday, Facebook!