Top Twitter hashtags by location. HashtagSense. HashtagSense. Hashtags. Hashtags Introduction 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. Hashtags.org - home. URL for #Hastags.