We launched a new website last week, along with a new forum platform which uses gravatars as default profile pictures. There are a few options as to what people’s default gravatars could look like, and we decided that the “retro” style which uses a hash of a user’s email to create a picture unique to them would be more interesting than just a default grey user profile. Of course if a user already has their own gravatar set up it will use that instead, or if you just wanted to change your picture for this site only you have that option as well on your /my-account page.