Yuri Milner, chief of Moscow-based Digital Sky Technologies, has built a reputation as one of the social-media world's most powerful investors by pouring hundreds of millions of dollars into companies ranging from Facebook to social-gaming site Zynga. Now Milner, a former physicist, is raising cash for another round of major social-media investments, hoping to cash in on a social-marketing boom. "In the next three years, everything on the Internet will be becoming social," he says. "There will not be a site that will not be social, which will allow advertising to become much more targeted."

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