I reckon if somehow you let the connection be made between your username etc & real life. And then if the police already wanted you & wanted to prove you were into it for a longer time than you were stating in court etc.. if they could they would. I would be pretty sure a site like this IS on the radar of the law & the easiest way for them to use data from a site like this is to use a robot crawler to harvest the website searching for certain strings, IP's & seperately identifyable domains.

If workers can be caught watching porn because a piece of software can identify pictures with 75% or more skin tones then this site could be crawled using several rulesets.

I don't post pics of myself or enough to even identify a room but I'm not overly worried about it. The site owner could tell from there stats package how many robot other's crawl the site or if the CIA/FBI is listed as a visiting domain. Ive seen there domain on many more innocent type sites than this.