May 2009 data from Nielsen Online shows that people continue to spend more time on social networking and blog sites than ever before, with total minutes increasing 82 percent year-over-year and the average time per person increasing 67 percent year-over-year in May 2009. Twitter.com was the fastest-growing Web brand in May 2009, increasing 1,448 percent year over- year, from 1.2 million unique visitors in May 2008 to 18.2 million in 2009. Despite being the fastest-growing brand year-over-year, Twitter's month-over-month growth has begun to slow, increasing 7 percent from April. The average time per person on Twitter increased 175 percent year-over-year, from 6 minutes and 19 seconds in May 2008 to 17 minutes and 21 seconds in May 2009. However, month-over-month growth was flat, decreasing one percent from April 2009.
networking site in the U.S., garnering 75.4 million unique visitors—a 190 percent increase
over May 2008
streams in May, with 116.1 million video streams
from 9.9 million in April 2009 to 12.2 million in May 2009.
Download Nielsen Online's May 2009 data on social networks.