We have added a new metric to our Facebook page reports - Fan Change by Source. This metrics allows you to see where your new fans are coming from and what caused unlikes. The sources of gained and lost fans can include ads, news feed, likes/unlikes from your page and posts, search, page suggestions, deactivated accounts and suspicious account removals, and more.

The new Fans Change by Source metrics is now available to all users in the Audience section.