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The creation of the guidelines reflects concerns about the misuse of sites like Facebook and Twitter and follows accusations of misconduct by teachers with students.

Trayvon Martin's death illustrates the growing numbers of black and Hispanic Americans harnassing the power of social networking sites.

Anyone worried about an erosion of America's global status might consider this modest fact: Facebook is the dominant social network in Mongolia. Along with its pervasive social media, the United States leads in myriad other ways - from the allure of its movies and music to the reach of its military. It's tough to match a nation that deploys troops to Australia and central Africa, propels Beyonce to global stardom, and produced the Twitter-style technologies that abetted the Arab Spring.

Newt Gingrich may occasionally refer to a Twitter hash tag as a hash mark but he is relying on the Internet to reach out to voters, one tweet and Facebook friend at a time.

In the age of Twitter and Facebook, many Super Bowl viewers will use the commercial breaks to go online and see what people are saying about the game. This year, advertisers want them to tweet about their favorite commercials as well.

Micro-blogging site Twitter is joining the ranks of Facebook and Google+ as it launches 'brand' pages as part of a service-wide redesign.

In an anonymous industrial park, CIA analysts who jokingly call themselves the "ninja librarians" are mining the mass of information people publish about themselves overseas, tracking everything from common public opinion to revolutions.

People with accounts on both Facebook and Twitter have been able to update them both simultaneously for a long time -- but from Twitter to Facebook, and not the other way around. That’s about to change.