Gravatar is useful, but I do not like external URLs. Anyway, we can surely think about do not hot-link the image (to do not add external resources that is surely a privacy concern) but download and upload it in Phabricator, maybe using a daemon action to keep everything scalable.

Maybe this can be done with an ad-hoc Phabricator extension that:

• add a new section in the User profile settings below Upload New Picture, something called Update from Gravatar with just a button
• when clicking the button, insert a new Phabricator daemon action to download the Gravatar image and to upload it in Phabricator and set that as profile picture
• tell the user that in few seconds his/her image will be updated or something like that

We can follow this upstream:

https://we.phorge.it/T15671