'FakeOFF' is a Facebook app that helps to clear out fake Facebook friends. FakeOFF describes itself as a "human antivirus" app, that clears out fake profiles. This is valuable for decreasing scams, spammy content and promoting real interaction with real people.
Once permission for the app is granted, FaceOFF goes back 365 days of a user's Timeline activity and makes use of an algorithm that assigns Facebook friends a credibility score on a scale of one to 10.
While it's possible to manually check to see if a user is just using a profile photo they found on Google with reverse image search, FaceOFF does this automatically with its 'Image Fraud Scan' and it makes removing people who are not real people at all your list of friends a cinch.