Its a pretty good bet. I used to give them the benefit of the doubt, but almost every time someone posted a picture of themselves, they were really gross looking.    I specifically remember a thread of comments a while back, dudes complaining about not being able to take their daughters/nieces/whoever to the park or the store without people giving them the stink-eye.  A couple people even had horror stories about randoms calling the cops on them because they thought they were a pedophile.  I thought this was odd, since I (mid-twenties) have taken my little sister (8 or 9 at the time) to the park or to the store before, and had no issues.  Then a couple of them posted pictures of themselves... and they really did look like the kind of people you wouldn't trust around kids.  Overweight, neckbeards, generally creepy looking.  Though strangely enough, whenever a 'post pictures of yourself' thread pops up in askreddit, the attractive people are always the only ones upvoted to the top.