The social giant seems to feel sudden shift of likeliness in not better ways, as The Wall Street Journal reports that Facebook’s U.S. user growth rate is slowing sharply. According to research firm comScore, in April, U.S. unique visitors to the website increased to 158 million, up just 5% from a year earlier, which is one of the slowest growth rate ever seen in Facebook history.
Talking about the time people send on the social network is also decelerating. In April, book users spent more than six hours a month on the site, up 16% from a year earlier, but that compares with a 23% increase in 2011 and that of 57% in 2010.
“The U.S. is a dominant source of revenue for Facebook,” said eMarketer analyst Debra Aho Williamson, who estimates that this year the nation will account for 51% of Facebook’s revenue. Approximately 56% of Facebook’s 2011 ad revenue of $3.1 billion came from the U.S. alone, according to the company’s regulatory filings.