I just got a spam u2u message from «esther_4U», and I suspect others may have.
It's a classic daughter of a late husband and wife, whi need help transfering money.

I saw it when I checked my email. All of the U2U activity for that account will be purged momentarily. After that, I'll look at whether we can adjust settings or create new settings to throttle or quarantine private messaging from new users.