BEWARE: Facebook has recently modified their Terms of Service (TOS).
It appears that whatever you post, including photos, can be used however they like, in perpetuity. And don't think deleting those previously-posted images will protect you...their new terms of service covers those too. Facebook now owns anything you've ever posted and can do with it whatever they please.
"...You hereby grant Facebook an irrevocable, perpetual, non-exclusive,
transferable, fully paid, worldwide license (with the right to
sublicense)
to (a) use, copy, publish, stream, store, retain, publicly
perform or display, transmit, scan, reformat, modify, edit, frame,
translate, excerpt, adapt, create derivative works and distribute
(through multiple tiers), any User Content you (i) Post on or in
connection with the Facebook Service or the promotion thereof subject
only to your privacy settings or (ii) enable a user to Post, including
by offering a Share Link on your website and (b) to use your name,
likeness and image for any purpose, including commercial or
advertising, each of (a) and (b) on or in connection with the Facebook
Service or the promotion thereof."
There's more!
"...You may remove your User Content from the Site at any time. If you choose to remove your User Content, the license granted above will automatically expire, however you acknowledge that the Company may retain archived copies of your User Content."
And more!
"...The following sections will survive any termination of your use of the Facebook Service: Prohibited Conduct, User Content, Your Privacy Practices, Gift Credits, Ownership; Proprietary Rights, Licenses, Submissions, User Disputes; Complaints, Indemnity, General Disclaimers, Limitation on Liability, Termination and Changes to the Facebook Service, Arbitration, Governing Law; Venue and Jurisdiction and Other."
I deactivated my Facebook account today.