Backtweets is a great way to find, track and monitor links that spread on twitter. 
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The ultimate Conference visualizer allows to monitor the live streaming of tweets about a specific keyword or hashtag. Read people\\\'s thoughts and suggestions about a conference in the exact moment they write them. Get more from your conferences! 
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CrowdEye is a real-time Twitter Search Engine that aims to stand out from the rest of the search apps out there by introducing some interesting new features.

 
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Flaptor is a search engine for Twitter. You can add it as a Search Engine option for Firefox. 
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Simple live search on multiple social networks. Sort tweets by authority, location and link to find out in a glance what the influencers are saying about subjects that are important to you or your brand. 
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Add A Twitter Search Box To Your Site 
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