[Ipstenu (Mika Epstein)]

Hotlinking is NEVER acceptable behavior unless it’s from a site that promotes it (like imageshack.us) as something they provide.

Unless you want to figure out a way to have your forum dissallow links TO the image site, the best thing to do is make a post now to tell people not to hotlink. And when they do it, edit the post to remove the image and tell them ‘Hotlinking is BAD AND WRONG.’

http://altlab.com/hotlinking.html