Clarifications and corrections: 1) CW = content warning - see https://gist.github.com/joyeusenoelle/74f6e6c0f349651349a0df9ae4582969#what-does-cw-mean 2) why? see https://code4lib.social/@pbinkley/109292848424623313 - and note that unlisted tweets still appear in your followers' home feeds, just not in local and federated; and anyway you probably don't need to thread so much here, with the high max character count 3) there are bots to remind you to add descriptions: @alt_text@mastodon.social 5) unfortunately it turns out you can't actually do this: see https://code4lib.social/@pbinkley/109303508890315316