I noticed some time ago that when some of my clients posted photos I'd taken for them on Facebook, my copyright info appeared above the images. Facebook extracts this from the image metadata. This is a very good thing, and a big deal.
Photographer Conrad Chavez has a very detailed blog post about how this works at http://goo.gl/gE1F4.
Note that the image Title and Description will also display, assuming those fields are filled in in the photograph's metadata.