Below is an excerpt from a summary report about the research:

Key Findings
• The percent of time people spend communicating online has increased 18 percent since 2006, while time spent on entertainment had declined 29 percent
• 105 million Americans contribute to social media
• Social networking has grown 93 percent since 2006
• 7 million Americans are “heavy” social media contributors (6+ activities) who connect with 248 people on a ‘one to many’ basis in a typical week
• 54 percent of micro-bloggers post or “tweet” daily
• 72 percent of micro-bloggers under age 18 post or “tweet” daily

(http://netpopresearch.com/node/prdownload/2657)