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Foreign user account information is embedded in incoming Status messages. Problem: how to decide when to update the account info (e.g. avatar changed).

First theory: if `updated_at` is newer, update the account. But `updated_at` isn't in the payload.

Second theory: if `statuses_count` is higher, update the account.

Nope. Mastodon fires off a WebFinger for each account once a day. Even though all the data we need is already in the Status payload we just got.