Some services use Gravatar[1] or Libravatar[2] but a user has to first register their email with those services. [1] https://en.gravatar.com/ https://en.gravat

Some services use Gravatar[1] or Libravatar[2] but a user has to first register their email with those services. [1] https://en.gravatar.com/ https://en.gravatar.com/ [2] https://www.libravatar.org/ https://www.libravatar.org/