Is it illegal, as someone had commented in another forum, to hotlink and post someone's photo (say from facebook or friendster), onto a forum, without the other party's permission?
not if it is a public site, i don't think there is going to be much of a case there
The issue of hotlinking as opposed to direct reproduction is a very difficult question legally and the last time I looked at this topic, there isn't even settled cases and those which decided on that issue were heavily criticised. Admittedly that was in 2001, so if anyone is feeling particularly in a research mood, perhaps they can share their findings with us
Always post a link back to the original photo or the author's site.