Especially gravatar which is capable of building a profile across every website that uses them without caching avatar images locally. Even for non-users, even r

Especially gravatar which is capable of building a profile across every website that uses them without caching avatar images locally. Even for non-users, even retroactively. There's a reason why I add some "+semirandomstring" to the userpart of my email address when writing comments (and hope that "helpful" services don't strip it out before md5'ing it for gravatar).