Terrible advertising
This popped up on the right-hand advert bar in my Facebook today.I now expect flowers from everyone for Thanksgiving. You can wait, though, until there's a year in which Thanksgiving falls on Thursday, November 17th, as I'm fairly certain that would be never. (I'm sure Patrick can mathematically prove this.)
Maybe the ad is referring instead to the famous Greek Marxist group, whose signs I occasionally saw the summer I lived on Crete.

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Q.E.D.
--Patrick