[cstreit]

Many of those links are not actually pictures, but appear to be so. Often they refer to a PHP file which attempts to execute a malicious script.

The other side is them just trying to get inbound link pointers to some website to increase search engine rank...

THe admin's here (myself included) probably delete at least 20 of these a day. We have a tool to delete all posts byt he offending user at one time and then ban them immediately. However it doesn't do much good because they use rotating random userid's and IP addresses. Diligence is the key..