From Pew Research:
Twitter is a modern public square where many voices discuss, debate and share their views. Media personalities, politicians and the public turn to social networks for real-time information and reactions to the day’s events. But compared with the U.S. public overall, which voices are represented on Twitter?
To examine this question, Pew Research Center conducted a nationally representative survey of 2,791 U.S. adult Twitter users who were willing to share their Twitter handles. The design of this survey provides a unique opportunity to measure the characteristics and attitudes of Twitter users in the United States and link those observations to actual Twitter behaviors, such as how often users tweet or how many accounts they follow.
The analysis indicates that the 22% of American adults who use Twitter are representative of the broader population in certain ways, but not others. Twitter users are younger, more likely to identify as Democrats, more highly educated and have higher incomes than U.S. adults overall. Twitter users also differ from the broader population on some key social issues. For instance, Twitter users are somewhat more likely to say that immigrants strengthen rather than weaken the country and to see evidence of racial and gender-based inequalities in society. But on other subjects, the views of Twitter users are not dramatically different from those expressed by all U.S. adults.
As a result, much of the content posted by Americans on Twitter reflects a small number of authors. The 10% of users who are most active in terms of tweeting are responsible for 80% of all tweets created by U.S. users.
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