questionsis the "hashtag" (#) played out already?

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Yes. Almost as badly as referring to people using an "@" prefix.

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Yes, very much so, especially when used it places other than twitter, where it really has no relevance.

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@kayak206: I'm sure you're aware that using the "at" symbol on this site sends an email alert to people (who have that feature enabled) that they've been mentioned?

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@magic cave: And I'm sure you're aware that I don't care, but it only sends an email if your account is set to do so. And it doesn't make it any less obnoxious when people in any random comment section of news sites etc use the symbol as a prefix.

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@kayak206: I'm so sorry that my comment added to what was evidently a bad day for you. Hope you feel better soon!