1.0 link 171828 http://www.huffingtonpost.com/sally-horchow/twitter-in-the-zeitgeist_b_171828.html People have different barometers for assessing trends. Some look at very specific metrics, expensive reports, or Google Zeitgeist. My approach is not so scientific: sisters and sitcoms. If my sister in Dallas is suddenly singing along to 50 Cent, the guy's reached critical mass. Or, if I hear a phrase uttered on a network sitcom (like: "Not so much," "No you d'int," "Really?!?"), I know it has trended past its prime. "Jump the shark," the phrase that defines...

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