Twitter use as still on the rise as of February 2012. In fact, for internet users age 18-24, the number using Twitter in 2010 (16%) nearly doubled (31%) by February 2012.

Also of interest is the percentage of the internet population who use Twitter overall. It has also nearly double from 2010 to 2012, coming in at 8% and 15% respectively.

Pew Internet Research has been tracking Twitter use in their Pew Internet & American Life Project. What the project has uncovered, is a general upward trend in adopting Twitter for daily use overall. Pew has also made the effort to organize the information by age and year in a some clearly illustrated charts for us.

Take a look at the Bar Graph’s created by Pew:

While Twitter use in the United States is on a steady upward climb, the platform is seriously investing in their international reach to bring a wider Twitter user-base and attract more global advertising interest.

Late last week, Twitter announced the completion of a major reorganization effort and some prestigious new hires which seemed mostly to be centered on pushing international sales and development efforts.

Also noteworthy in their success, Twitter mobile advertising is growing very fast, and as we all know, mobile is the future of marketing, and huge ad revenues as well. In fact, last financial quarter, they were at times earning more from mobile ads than from web.

With over 500 million registered users and 140 million daily users, it doesn’t seem like they’ll be slowing down anytime soon. Revenue growth for the company is expected to exceed $269 million this year.

(Image courtesy of Twitterism.com)