at registration ******.info for me automatically established userpic. tell me the name of this plug-in or a it's basic function xenforo?
You can change these images to whatever you like.
If you register by Facebook, it will automatically grab your Facebook avatar.
Also, there's a feature called Gravatar which is a third party service. If the site has Gravatar enabled and your e-mail address is signed up to Gravatar, it will pull whatever avatar you have set up there.