BrightKite integrates with Facebook, Twitter, and other social media services, and there are privacy settings you can use to determine who can see your location and who can’t. Sometimes, you might not want others to know where you are (ahem). It also interfaces with Flickr, so you can send photos there. (Don't get me started!)
I signed up for FaceBook (or BaseFook, as they like to say) maybe two years ago, and Twitter last year. What's next?
Any of you readers signed up already? Anybody heard about it and like it/hate it/don't care? Thoughts?
UPDATE: I just thought of this. If your kids were out and about, this might be a good way to keep tabs on them. Just sayin'.