Who Unfriended You, and Why
Barence writes "Given that social-networking sites like to put across a happy-clappy image of friendship and joy, it's not surprising that they're less keen to tell you when someone doesn't want to be as friendly with you any more. PC Pro reveals how to find out who really hates you on social networks. It's possible to track who's quietly dropped you from their Facebook friends list, for example, by installing Firefox's Greasemonkey add-in and running a special script. Meanwhile, there are sites that will reveal the exact tweet that turned people off your Twitter account."
I'm pretty sure I don't really give a crap who drops me. I go through my list and clean house about once every couple months. As a racing cyclist I get friend invites all the time from people I barely know. I keep them around for a while and if they don't participate or I find I really don't like them in person I add them to the drop list for next housecleaning time. People worry about what other people think about them WAY too much. I just don't give a fuck.
Keep your friends close, and your enemies closer.