Locked ReTweet - Sharing something (hopefully with permission) a locked (private) account has said, manually.
LRT: "Some deep and insightful thing from a more private friend that deserves wider attention."
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Acronym of "I'm Sure You Know This".
ISYKT, but <hopefully not mansplaining the thing you're sure they know, but that you're saying for the benefit of the audience on social media>