All I know is:
a) don't post a photo owned by someone else without their permission
b) don't post copyrighted material (be it a pic of copyrighted material, picture, manual, etc) without permission from owner
c) It's not a crime or violation to post pictures of folks you know or knew - permission granted. Could be a bit loony if too much detail
included.
d) also anything that violates other forum rules, nekidity, distasteful body cavity surgery and the like, nasty stuff
These may not be exact forum rules, but these are general net rules I follow, seems to work here.