2

A number of questions have "PSA: " in the title, like it's being used as a faux-tag. But searching for it using the box in the upper-right just gives 3 such questions (why only 3?) And not any explaination.

4

It means "public service announcement" and has been used in meta posts by some users to indicate a "question" that is intended to be informative rather than actually be a question.

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