The number of Twitterers is growing quickly, per a Pew Internet Project report released Oct. 21st 2009. The report states that 19 percent of all U.S. Internet users now use either Twitter or smaller services, such as Yammer, to share social updates. This was up 8 percent from the 11 percent who used such services in April 2009. Twitter and other status services were most popular among those 18-24.