Online spending up double digits; tweeting at Harvard Biz; hitting the Hispanic market; giggling for Yahoo!, and more Online ad spending up Here’s a little silver lining for agencies and publishers: Online ad spending will see double-digit growth, reaching $61.8 billion worldwide this year and $96.8 billion in 2014, according to an eMarketer report cited by AdWeek . Hopefully that rising tide will lift all boats. Business schools heart social media You knew it would come to this. One minute you’re tweeting just for fun about how yummy that bagel was this morning, and the next you’re…

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