Today I learned. The signature opener of Reddit's r/TodayILearned community, used whenever someone wants to share a fact, statistic or piece of trivia they've just discovered. The format has spread off-platform and is now a generic way of flagging "here's something I didn't know until just now".
TIL that octopuses have three hearts and blue blood.
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Viral internet speak — memes, ratios, main-character moments, and the algospeak of every platform from Twitter to Reddit to TikTok comment sections.
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Browse all slang words starting with T.
You should know. The opener used in Reddit's r/YouShouldKnow community, where users share useful life tips, warnings and bits of practical information they think more people ought to be aware of. Functions like a friendlier, more advice-flavoured cousin of TIL.
Too long; didn't read. Used either as a request asking someone to summarise a long piece of text, or as a self-applied tag at the top or bottom of one's own post to flag the short version for readers in a hurry. Common on Reddit, Hacker News and email threads, where the "TLDR:" line is often a one-sentence summary of an essay-length comment. Sometimes spelled "tl;dr" with the semicolon preserved.
(chiefly, Internet slang) Used to indicate that one did not read a (long) text, or to introduce a short summary of a text perceived as overly long.
(Internet slang, originally, 4chan) A sudden revelation of devastating and undeniably true information.