Twitter was born as a text messaging service; tweets are 140 characters because that is the length of a text message, minus a few characters for the author’s name.Today, though, most people in the United States think about Twitter as a Web tool, and they use it either online or via smartphone apps.But Twitter has not forgotten about all the people in the world who do not have fancy phones. On Friday, the company announced that it had acquired Cloudhopper, a Seattle text-messaging start-up.There is “untapped potential” with Twitter text-message use “Mobile is clearly where the majority of usage will happen,” Evan Williams, Cloudhopper has already been working with Twitter to connect its service directly with mobile carriers around the world, in part so that users do not have to pay extra to send or receive text message tweets. Twitter has long had problems with this, and in the past has had to disable text messaging in certain countries because of high fees.Read more at bits.blogs.nytimes.com