Public service announcement. Borrowed from broadcast TV, where a PSA is a short non-commercial spot warning the public about something. Online, it's tagged onto posts where the writer wants to flag useful information or a warning to a wide audience — sometimes seriously, often sarcastically.
PSA: your "private" browsing tabs are not as private as you think they are.
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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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