I don't know if this has been discussed but I don't think it can be over-discussed. There are many ways that we can all be profiled (by LE, an enemy etc.). If we are doing it right our lives are made up of just as much misdirection as direction. But even the best cover is not much of a cover thanks to free analysis sites. One in particular worth mentioning is http://snoopsnoo.com/ because it specializes in Reddit analysis. I hope some of you visit the site and plug in your /r/darknetmarkets posting name because I think some of you may be a little bit surprised at how well you have been profiled even though you feel you are doing pretty good OPSEC on this sub.
Here's the good news - at http://snoopsnoo.com/ on the right side of the page you are able to "correct" some of the assumptions. I think with a proper strategy you can eventually get the http://snoopsnoo.com/ database returning false values. If nothing else, this is a great tool to show you where your trap is doing too much yap. There are also some people that may assume (correctly) that the profile is too accurate and use that as a reason to abandon your current account. After abandoning any account make sure to OVER WRITE not just delete all posts. There is a 1 click grease monkey script for that.
For entertainment I plugged a couple of names in. First one I plugged in was because I have been amazed at his volume for such a short time:
http://snoopsnoo.com/u/RIP_Meth_9000
The other name I plugged in was for no particular reason other than who it is:
http://snoopsnoo.com/u/Vendor_BBMC
Finally, here is an example of someone that has mostly kept personal information out of the equation.
omg I love how Meth_9000's tag cloud is a veritable online portrait:
One giant "meth" in the center in blue letters surrounded by tons of slightly smaller "bahahahaha's" LOL!!
Vendor_BBMC's is almost the same except with "world's best Vendor" thrown in there in lieu of the bahahahaha's hahaha!!