Blogger has 10 million active users - people who have posted in the last 30 days

"Blogger (now owned by Google) has 10 million "active" users, or people who have posted something new over the past 30 days. The number of "seven-day active" users has doubled over the past two years. Blogger has 300m unique visits a month. In an average minute, 270,000 words are written on its blogs, and something like a quarter of a trillion words have been written on Blogger since its foundation."
Source: John Naughton, The Observer, 13th September 2009