LinkedIn is introducing content-based services in a bid to drive ad revenues, and has in recent months has rolled out an advertising API and a number of new ad units. But some observers fear that's the start of a Facebook-style strategy that will clutter the network and reduce its utility for professionals. "LinkedIn needs to find a way to convince its user base that it still is that professional, valuable network. The reason you go is to be in a professional space," says Kassidi Warnock, digital content strategist at GrowthWeaver.

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