Switcheroo: Days of Wild Growth Appear Over at Facebook

Facebook Inc. FB +3.00% went public last month on its prospects for growth. But in some key areas, the social network's growth rates are already maturing.  In particular, Facebook's user growth rate in the U.S. is slowing sharply. In April, U.S. unique visitors to the website increased to 158 million, up just 5% from a year earlier, according to research firm comScore Inc.

Facebook's user growth rate in the U.S. is slowing dramatically.

That was Facebook's lowest U.S. user growth rate since comScore began tracking the data in 2008 and was down from 24% growth in April 2011 and 89% in April 2010, comScore said.  At the same time, the growth rate in the amount of time people spend on the social network—otherwise known as engagement—is also decelerating…..

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