[barkerja]

I don't know if I have ever received an iMessage spam, and I have 6 addresses associated (5 emails, 1 phone number).

SMS I get spam almost daily.

[dwaite]

I've gotten local political messages from volunteers, but those were sent from their cellphones (and may have resulted in them being banned from iMessage a few days later)

I've never gotten an automated spam via iMessage protocol.