It's a #hashtag takeover

The # is having a moment. No longer just a pound or number sign, it's been born again on Twitter as a way to link tweets of the same topic or add a quick quip.

Super Bowl advertisers go after 'second screens'

(AP) -- Call it the "second-screen" Super Bowl. About two-thirds of smartphone and tablet owners use their gadgets to do things like text or post on Twitter while watching TV, according to research firm Nielsen. So, for ...

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