Back at my computer so I can elaborate.
For the past 18 months we've been doing the "Is this a Luka profile / post" game. In each one that we verified was him, he would always either make a mistake or he would link another account that would lead back to him somehow. Either comments made by another user that we had already verified were him, or comments made by a new user that would lead back to him.
In posts or pages that he wouldn't link back to himself somehow, he would make clear typo's, grammatical errors, post images of himself, or CAPITALIZE weird words I'm sure you're all aware of them now. Im sure there are many many many profiles / posts that we never found that he never made these sort of mistakes on, and they are just unknown. In these types of posts its impossible (for me) to say if its him or not, and I'm tired of playing that game LOL
Luka would have very, what I called; "Lucid Moments" where he would type very well. If he hadn't made a mistake, or purposely led that post to him, the post or profile would never have been found.