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The canonical example of a hashmob emerged a few days ago around the hashtag #amazonfail.
When you see pound or something pound followed by letters on Twitter, it means there's a hashtag .
Hunt mistook an @ for a hashtag while tweeting derogatory thoughts about him
the hashtag #riotcleanup is being used by community members to coordinate some post-riot street-cleaning
However, hashtag use was significantly higher among spammers.
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