Read, consult a real lawyer.. not just those who play one on the internet. Especially read about the direct claims made against you. Right of Publicity is interesting. Don't listen to the content providers who post, because there's a definite difference between their unknown skanks and celebrity skanks.
Here's one article from UCLA Cyberspace Law that you can do some research from:
http://www.gseis.ucla.edu/iclp/manship1.htm
Another example of actual cases:
http://www.phillipsnizer.com/int-rightpub.htm
from this site that lists many more
http://www.phillipsnizer.com/internetlibrary.htm
More:
http://www.lawrencewalters.com/celebrity_fakes.php3
Thumbnails are Fair Use
http://biotech.law.lsu.edu/cases/IP/...rriba_soft.htm