I'm a pretty private person. I'm very careful about the information I provide online. When I travel I try not to give any indication I'm out of town. If I've got things to post I usually wait until I'm back home to do it. I never give out when I'm taking vacation and I don't have my birthday posted on Facebook.
By now you've probably figured out I have not been a big user of location based social networking sites. That may be changing though. Here's a pretty cool video from foursquare.
Curating the most relevant subject knowledge, finding information that’s useful in real time. So simple and makes so much sense. It may be time to turn on my mobile device GPS radio and bring a little more context ( highly controlled of course :) into my life!