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"Twitter is a social network used by millions of people, and thousands more are signing up every day to send short messages to groups of friends. But where's the user manual for Twitter? Where do new Twitter users go to learn about Tweeting, retweets, hashtags and customizing your Twitter profile? Where do you go if you want to know all about building a community on Twitter, or using Twitter for business? How can you find advanced tools for using Twitter on your phone or your desktop? To answer all these questions and more, we've assembled The Twitter Guide Book, a complete collection of resources for mastering Twitter. Happy Tweeting!"

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Ever wonder why people use "#" in their tweets on Twitter? Do you want to know what a specific hash tag like #surnames or #brickwall means? Learn how to use hash tags and then leverage their power through searching and analytics.

This column has previously focused on African-American genealogy blogs, in the articles Shout-outs to African-American Genealogy Blogs and More shout-outs to African-American genealogy blogs. A third edition soon forthcoming will spotlight several new genealogy blogs. The responsible genealogist, however, would be advised to learn more about United States history, including how it affected African-Americans. History blogs are a vital source for keeping up with current perspectives as well as newly available historical resources, many of which may provide genealogically useful information.

From CSI to The Maury Povich Show, DNA and DNA testing has become a part of American popular culture. But what is DNA? In simple terms, DNA is a string of proteins that contain coded blueprints for our bodies. It tells our bodies how to grow. We inherit our DNA from our parents, which is where its genealogical value comes in.

The Newberry Library in Chicago has created a remarkable tool to visualize county boundary changes over time. The site allows the viewer to use map layers to picture how county boundaries fluctuate.