@JeremyCherfas @matigo Point 1 regarding permission is in an interesting gray area with Tweets. Twitter’s contracts seem to say you’d be fine backfeeding as long as you preserve their display guidelines - developers are one of the parties they sublicense content to at their discretion, as the original author agreed to.
But then their display policies throw in a parenthetical hemhaw about how you maybe need permission in some cases, with zero further elaboration.
Searching for that contradictory line led me to a summary of all I worked out [media.gn.apc.org], but no further clarity. :\