Once upon a time there was a service for avatars and people used to contribute their real avatars (pictures of faces). I contributed mine and it used to pop up at random apps, websites, and such.
I remember the services (faces, or avatar, something) but it was since the early 2010s.
The one I meant is a service, where you can use something similar to the service in this post thread but with real avatars contributed by people on the Internet.