Gravatar

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Gravatar is a silo service to host a profile photo (avatar) for e-mail addresses. The photos can then automatically be displayed on your posts and comments on any website that supports it.

Criticism

Gravatar is based on MD5 hashes of e-mail addresses, which has been used to deanonymize users in the past: [1], [2]. You're effectively leaking weakly-hashed user data.

See Also