MEDIABUYER PLANNER -- Jan 22 -- MySpace.com is again atop the rankings of U.S. social-networking sites, with 60.1 million visitors in December, up from November's 57.4 million unique visitors and 55.3 million a year earlier, according to Nielsen Online. Ranked second among social-networking sites, Facebook increased the number of visitors to nearly 22.6 million, up from November's 22.0 million - and up 72% vs. Dec. 2006, whereas MySpace visitors increased just 9% year over year. See table of top 10 soc-net sites. MORE NEWS @ SOCIAL NETWORKING WATCH

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