Twitter grew 1,448 percent from this time last year, but its growth is slowing as the year goes on, according to Monday data from Nielsen.
The micro-blogging site logged 18.2 million unique visitors in May 2009, up from 1.2 million in May 2008, and up 7 percent from April 2009. Those stats make Twitter the fastest growing brand year-over-year, but that growth is starting to slow, Nielsen said. Time spent on Twitter also increased 175 percent from last year, up from 6 minutes and 19 seconds to 17 minutes and 21 seconds. That was down 1 percent from April 2009, however.
Elsewhere in the social networking sphere, Facebook remained the number one global social networking site in May for the seventh month in a row with 144.3 million unique visitors. It was also number one in the U.S. for the fifth month in a row with 75.4 million visitors - a 190 percent increase from May 2008.
MySpace was still number one when it came to total video streams, with 116.1 million video streams. Unique video views jumped 22.9 percent month-over-month, from 9.9 million in April 2009 to 12.2 million in May.
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