10/22/2009 - Nearly a fifth of online Americans now share or read status updates on services like Twitter, and wireless devices like cell phones and laptops are driving the growth, according to the latest study by the Pew Research Center.
A survey of 2,253 adults showed that 19 percent of all Internet users "use Twitter or another service to share updates about themselves or to see updates about others," a significant increase from the 11 percent reported in previous surveys dating back to December 2008, according to the Pew Internet and American Life Project.
Twenty-five percent of wireless Internet users in the United States now use Twitter or another social media status update service, according to the study conducted from mid-August to mid-September. A December 2008 Pew survey found only 14 percent of wireless Internet users were on Twitter.
And people were more likely to tweet if they owned several wireless devices, including a portable game console or an electronic book reader. About 39 percent of Internet users with four or more of these devices used Twitter, compared with 10 percent who owned only one wireless device.
Read the full article Study: More Americans Using Status Updates, Especially on Mobile Devices on the San Francisco Chronicle's Web site.