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Twitter Inc., the site that lets people share 140-character messages, is used by 13 percent of US adults online, up from 8 percent in November, as more older Americans embrace it.
Among users who own cellphones, 54 percent have used their mobile devices to access the social-media service, according to Pew Research Center. Twitter use has more than doubled since late 2010 among people ages 25 to 34, to 19 percent, and increased among adults ages 35 to 44, to 14 percent. Usage for those ages 55 to 64 doubled to 8 percent.