About 5 days later I decided that I was not going to give up one of the ways I kept in touch with my friends, and with an unknown, possibly limitless, exclusion period ahead of me, had the tweet removed.
And then on the 27th of January, a month later, Twitter support emailed me to say "Sorry, automated false positive."
And it has to be said that a system where an appeal takes a month to go through is not even slightly useful, essentially forcing you to admit guilt if you want to use their systems.
Original post on Dreamwidth - there are