#Hashtags

Hashtags are a community-driven convention for adding additional context and metadata to your tweets. They’re like tags on Flickr, only added inline to your post. You create a hashtag simply by prefixing a word with a hash symbol: #hashtag. Hashtags were developed as a means to create "groupings" on Twitter, without having to change the basic service. To use hashtags, add @hashtags as a Twitter contact and then precede any tag you want to use with the hashmark (#) character.

Here are some examples of hashtags:

# Events or conferences: i.e.: "Tara’s presentation on communities was great! #barcampblock"
# Disasters: "#sandiegofire A shelter has opened up downtown for fire refugees."
# Memes: "My #themeword for 2008 is conduct."
# Context: "I can’t believe anyone would design software like this! #microsoftoffice"
# Recall: "Buy some toilet paper. #todo"

(Via Twitter Fan Wiki)

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