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If a pay-per-click (PPC) account and the advertiser’s business model are functioning reasonably well, we often find that a business owner becomes heavily dependent on the PPC channel. “Max the volume!” and “We’re down from last year, I’m very worried” are typical (if vague)...

Twitter recently announced that it will enlist academic research groups to help in its project on conversation health. The researchers will study the behavior of Twitter users to find ways to assess how healthy the discussions are and help rid the platform of racists and trolls....