it would be naive to assume that the Feds are oblivious to this site and all that it is. the BL Orlando bust has been brought up and that is good enough evidence that you should be protect yourself at all times when active on this site. I would never post pictures of my stash, surely not anything jaw-dropping in weight and I wouldn't even post pics of personal amounts, either. I think refusing to post pics of yourself is a little too far-fetched, but that is just me.
I am sure there are some undercover lurking and perhaps posting on BL - but it would be difficult to establish their actual numbers, even an approximate guess.
Bluelight does a good job of making it known that our prime directive is harm-reduction, and as a moderator myself it is our number one priority to keep our esteemed posters protected, safe, and secure. that is why us mods are so strict with dealing with users who post sources and all else that is possibly incriminating. please don't let this BL undercover paranoia tarnish your overall BL experience, be smart. I'm sure everyone who makes it known in the drug forums that they know their shit with drugs will get some sketchy PMs from time-to-time, Lord knows I've had my fair share. it's best to just ignore those types of messages and if they persist and don't get the message then bring it to the attention of a mod or admin.