The hugely popular micro-blogging service Twitter has come from a standing start in 2006 to become as well known as Facebook in the US, with African Americans proving particularly keen on “tweeting”.Some 87% of Americans know what Twitter is, compared with just 5% two years ago, giving it almost the same visibility as Facebook, which wins 88% awareness. But according to a study by the polling firm Edison Research, actual usage still lags far behind. Just 7% of Americans are on Twitter, while 41% are on Facebook.
http://www.guardian.co.uk/business/2010/may/10/twitter-rivals-popularity-facebook
Twitter catches up with Facebook in US
The hugely popular micro-blogging service Twitter has come from a standing start in 2006 to become as well known as Facebook in the US, with African Americans proving particularly keen on “tweeting”.