27
Jan
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If you've never heard of Stack Exchange, you're missing out on some of the best Q&A-style sites on the Internet. Each site is a community built to encourage people to ask and answer questions. Reputation and badges can be earned by giving good answers and comments. With over 120 communities (and growing), there are sites dedicated to programming, server management, gaming, travel, and even anime. The one thing that has been missing was a good mobile application.

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