Foursquare. Yelp. Gowalla. There are plenty of services allowing you to let the world know where you go. And now there’s a new one from Facebook: Facebook Places. (Facebook Places is currently for the US only.)

Announced by Facebook last week, Facebook Places works with Facebook for iPhone or if your mobile phone can access http://touch.facebook.com/. There will be a “Check In” button (Facebook will also ask to know your location.) You’ll get a list of places near you and you can either check in to an existing place or add one. Of course this shows up on your wall.

Not only can you check in yourself, but you can tag friends who are with you. Surely nobody would abuse THAT feature, would they? (More about that in a minute.) You can also see other people who are checked in with you in the same place.)

Personally I have no interest in participating in Facebook Places, though I’m sure all y’all would be fascinated by my extensive treks between home, work, and the grocery store. If you don’t want to play either — or if you want to make sure that your friends don’t check you in to places — visit this detailed article by LifeHacker which walks you through making sure your checkins are not shared, and that your friends can’t check in to places for you.