Only a small share of people who use twitter actually tweet and yes a smaller share of those people tweet on a specific subject. I'm no sure how this is news. "

Only a small share of people who use twitter actually tweet and yes a smaller share of those people tweet on a specific subject. I'm no sure how this is news. "Only a small share of U.S. adults product majority of tweets on ______." Fill in the blank.. only those interest in a topic will tweet about it.