inPulse smart watches require users to check into Facebook Places and Foursquare with a tap of their watch button. User should register a new app with Facebook, according to TechCrunch.

The watch communicates with the outside world (Android phone, BlackBerry, PC/Mac/Linux) via Bluetooth. Then user click his way through the list and choose which place to check in. So you have the opportunity to check in to Facebook without having to take phone out of pocket.