It seems #Twitter has reversed course on the policy and you are once again allowed to Tweet other platforms' usernames on their service.
And @AnneTheWriter, some instances have replaced "toot" with other words, because it was just too silly :) I go with the generic "post"
@volkris @AdmiralStav
But then we wouldn't have a #HootinTootinTuesday , when folks would post funny #memes and #humor, and I was really looking forward to that becoming a thing. 😏LOL
But yes, I've tended to avoid that term myself and say "post" more often than not.