U.S. Demographic Profiles at Facebook and Twitter

The comScore 2010 U.S. Digital Year in Review is now available for download.

Facebook saw its share of visitors between the ages of 35-54 decline 3.6 percentage points to 35.4 percent, while the share of visitors under 18 (up 1.2 points to 11.1 percent) and age 55 and older (up 1.9 points to 13.2 percent) made the biggest gains.

Twitter.com, meanwhile, saw a significant 9.4 point gain in the share of 18-34 year olds visiting the site while those under 18 declined 8.0 points to 9.5 percent.

% Composition Unique Visitors