Here are some of the facts :
Facebook alone has more than 300 million active users and HALF of those users log in on any given day.
20% of US adults use Twitter or some similar “status update service” (Pew Research Center).
77% of active Internet users read blogs.
More than 4 in 5 bloggers post product or brand reviews and blog about products they love or hate.
27 billion people—11% of all internet users—consumed podcasts in 2009.
By 2013, podcast consumption is predicted to exceed 37 billion users, which is projected to be about 17% of all Internet users.
The top 5 article sites attract 20 million viewers per month.
The top 10 social bookmarking sites attract more than 80 million visitors each month.