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“YOU are walking around naked on the Internet and you need some clothes,” says Michael Fertik. “I am going to sell you some.”

Naked? Not exactly, but close.

Mr. Fertik, 34, is the chief executive of Reputation.com, a company that helps people manage their online reputations. From his perch here in Silicon Valley, he views the digital screens in our lives, the smartphones and the tablets, the...