I have a public profile on facebook were I only post (watermarked) miniatures that links to my website. But a lot of photographers use it massively to share images. Effective yesterday the new FACEBOOK ToS are really scaring for pro photographers:
Source: ASMP – http://asmp.org/fb-tos
Effective today (September 5th, 2013) Facebook has put into effect new Terms of Service and privacy policies that radically increase Facebook’s power to exploit your content and identity. Facebook is now able to exploit your name, likeness, content, images, private information, and personal brand by using it in advertising and in commercial and sponsored content — without any compensation to you. Facebook is monetizing not just your images, but a sizable portion of your entire online identity.
Another good reason NOT to publish and share professional images using FB.