A hashtag is a way of tagging your message with a category.

For example, those of us who are up tweeting in the middle of the night might put the hashtag #afterhours

For example:

"argh. insomnia FTL. feel like sleeping now though. #afterhours"

The purpose of doing this is so you can do a Summize search (http://www.summize.com) for the hashtag and find all tweets about a particular topic.

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