While I do see the value of having a profile picture, the comparison you draw here doesn't hold. To answer this comment of yours, an avatar and a username are "

While I do see the value of having a profile picture, the comparison you draw here doesn't hold. To answer this comment of yours, an avatar and a username are "so different" in the sense that comics and novels are different: they can both tell stories, but the degree of freedom of imagination on the reader's part is larger in the latter case (this is only of minor relevance, but it takes apart your argument). Two, getting a username is considered a sunk cost, one many are willing to pay, but setting up a picture is an additional cost; some will pay, but I would wager many of us here won't bother. However, once you set up the option, there will be a "ah, they're the ones who like to update their profile pic!" and "ah, they're among those who simply don't care!" Assume many people don't bother, you still need to make do, which is your current situation. Third, user-selected pictures carry a lot more information than just the usernames, and this information may simply detract from the core of the site, which is the content and discussion. If you treat usernames just as differentiating handles, they currently serve exactly that purpose. Of course, you will be right to say that pictographs can be more efficiently retrieved from memory here, but the case doesn't seem strong enough to spur investing time into accommodating the functions in the code. I agree with pg above in this thread.