Ah, Facebook. We don't really get nor use it very often but we recognize that we're in the minority on that one. We also have those friends who meticulously and methodically check their status, friend count, "Likes" and what have you numerous times a day.
For those people, we humbly direct you towards Friend Tracker, the new app from Rudy Huyn (TVShow, MyEncyclopedia, Fuse, etc.). The app is simple enough: it looks through your contacts who are synced with Facebook and/or Live and keeps track of who's there, who's not and showing you a graph of the number of friends and activity.
According to the app's "How it works" section, Windows Phone checks this about once a day. But if you really want "real time" you can have the app login to your account and pull down the info on a much more frequent basis, like every 30 minutes or so.
It's a nifty little addition and completely free. Plus like all of Huyn's apps, really elegant. Here are some of the other features:
Statistics on the number of friends
So if you need to keep abreast of your social status, sounds lke you'll want to pick this up. Grab it here in the Windows Phone Marketplace.