A new report from the Pew Internet & American Life Project claims that 19 percent, or nearly 1 in 5, Americans who use the Internet also use Twitter or some other social networking status update service to keep in touch and share information about themselves with others. The bigger news is that this figure is almost double what it was in a previous survey in December of 2008.

Pew surveyed 2,253 Internet users, age 18 or older. A third of the respondents fell into the 18 to 29 age range. If you tack on the 30 to 49 age range you find that 55 percent of those who stay in touch via status update are under age 50. The survey also found a correlation between the number of wireless devices a person owns and the likelihood that they also use a status update service like Twitter. Only 10 percent of users with one Internet-connected device claimed to use Twitter, while nearly 40 percent of those with four connected devices use status updates to communicate. In fact, there is essentially a 10 percent per device relationship, with two devices coming in at 19 percent, and three devices at 28 percent.

One thing to note is the qualifying statement throughout the report that it is a survey of those “who use Twitter or another status update service.” Twitter is getting the attention from the survey, but based on the wording of the statement it seems that Facebook may make up a significant portion of the responses– perhaps more than Twitter.