Facebook's Nearby Friends feature keeps track of your pals, but only if they want you
 

If you're of the sort that likes to plan those otherwise impromptu encounters, Facebook has just announced a optional new feature that will certainly help with that. Nearby Friends will show you if your friends are close by, so you can reach out...

http://www.engadget.com/2014/04/17/f...=rss_truncated