Internet trolls and spammers have started invading products' Facebook pages to plug rival brands, creating a major problem for social marketers, writes Craig Daitch. Deleting comments is bad form, Daitch notes, but it's important to respond forcefully, either taking trolls to task or rallying your genuine fans to keep conversations on-topic. "Trolls and spammers are evolving," he warns. "With open communities, it is easy to exploit vulnerabilities."
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