The Air Force recently warned troops about the "devastating operations security and privacy implications" of location-based social networking services like Facebook Places and Foursquare. In other words: Don't check into your spy plane as it cruises over China. (Image via)

What's more surprising: The fact robbers in New Hampshire used Facebook Places to learn when homeowners were out of the house, or the fact we're surprised by this after Pleaserobme.com so effectively demonstrated the criminal possibilities of location-based social networking?

We've already told you how to disable (or enable) the feature in Facebook Places which allows other users to tag you at a location. Do this now! If you don't take any action, you're left in a confusing privacy limbo.

So, everyone's excited about the new Facebook Places, right? The Facebook service that lets you check-in, Foursquare style, at whatever hip Sushi bar/bicycle repair shop you happen to be in. Oh, and also other people can check you in, too.