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"The closest thing before this was the contextual advertising that Google was selling, but the problem was that it was clearly an ad," said Charlene Li, the founder of Altimeter Group, an online research and consulting firm. "Promoted tweets look just like every other tweet. The form factor, the way it is displayed in stream - that was a breakthrough."
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Over 30,000 Greek workers held a general strike on Tuesday in one of the biggest anti-austerity protests in Greece this year. It is over a law that will go before parliament on Wednesday that they claim could cost them their jobs.