comScore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released a study of online engagement at the top worldwide properties based on data from its comScore World Metrix service. The study found that Microsoft Sites captured nearly 15 percent of time spent online worldwide in September, making it the most engaging global property, followed by Google Sites and Yahoo! Sites. Facebook.com, which continues to see significant growth on a worldwide basis, was the fourth most engaging destination with visitors spending 1.4 billion hours on the site in September, up 193 percent from the previous year.

Microsoft Sites Captures Nearly 15 Percent Share of Attention Worldwide

In September 2009, nearly 27 billion hours were spent on the Internet globally by a record online population of 1.2 billion Internet users age 15 and older. Microsoft Sites accounted for 14.5 percent of total minutes spent online in September, making it the most engaging global property, with Microsoft’s Windows Live Messenger representing nearly 70 percent of time spent on the property during the month. Google Sites captured 9.3 percent of total minutes (2.5 billion hours), with YouTube accounting for nearly half of total time spent (1.2 billion hours) at the property. Yahoo! Sites ranked as the third most engaging Web property at 1.7 billion hours, followed by Facebook.com at 1.4 billion hours. Facebook’s share of attention reached 5.1 percent in September, an increase of 2.9 percentage points from the previous year, as its continued growth in popularity precipitated this surge in share.

*Excludes visitation from public computers such as Internet cafes or access from mobile phones or PDAs.