Feedmyapp is a Web 2.0 Directory with the best and latest web 2.0 sites and web 2.0 applications. 
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Floxee.com builds a custom twitter directory for your company, business, political campaign or any organization. This site may help people find your group on Twitter, it can also store the conversation through a searchable historical tweetstream option. 
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JustTweet.com is an organized by genre directory for Twitter users. It allow users to easily find other Twitter users to connect with. 
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A directory that lists Twitter apps, codes and widgets 
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TweetGrid.com is a powerful Twitter Search Dashboard that allows you to search for up to 9 different topics, events, converstations, hashtags, phrases, people, groups, etc in real-time. As new tweets are created, they are automatically updated. 
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Twibs is a business directory that lists businesses, apps, and services on Twitter. 
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Twitdom, The Twitter Application Database 
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A website that gives you an overview on the tools and applications that are available for twitter. 
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Visual directory for Web 2.0 websites and applications. 
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