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Hashtagify.me is a hashtag search that incorporates a visual element. Search for a hashtag and see a web of related hashtags, as well as some statistics like popularity percentage and usage patterns.
Hashtracking provides analytics on hashtags including the most influential Twitter users and the hashtag’s reach, presented as charts and graphs.
Keyhole tracks hashtags on Twitter, Instagram, and Facebook and provides information on demographics, reach, top influencers, other hashtags, and even which platforms (mobile, desktop) the posts came from.
Mention alerts the user whenever a mention pops up anywhere on the Internet. It also generates activity reports.
RiteTag rates your hashtags as you type to tell you if they’re overused, good, or great, so you can pick the most effective ones.
Seen lets the user search hashtags, but also corrals and ranks tweets for events from serious news happenings, to entertainment.
If you’re not sure what a certain hashtag means, you can look it up on Tagdef. If you do know, you can add a definition yourself.
This tool is an iPad app that lets the use organize hashtags, and then produce reports with stats on those particular hashtags.
The One Million Tweet Map
The One Million Tweet Map shows you the last million tweets sent. Think of it like a Google Street view for Twitter, so you can see what people in an area are talking about in general, or filtered through hashtags (if they have the location setting turned on when they tweet).
Twitonomy is in-depth Twitter analytics for many items including growth rates, tracked clicks for links, and lists of who doesn’t follow back.
What the Trend
What the Trend focuses on popular hashtags, how they’re ranking, and what they mean.