Some examples of uncivil communication include rude gestures, vulgar language, interrupting, and loudly having private discussions in public spaces. Recent poll data suggests that Americans believe uncivil communication is a serious problem, and believe it has led to an increase in physical violence. The 2013 study on "Civility in America: A Nationwide Survey", conducted by global public relations firm Weber Shandwick and public affairs firm Powell Tate in partnership with KRC Research found that 70 percent of Americans believe incivility has reached crisis proportions. Of those who expect civility to worsen, 34 percent blame Twitter. The study found that Americans encounter incivility, on average, 17.1 times per week, or 2.4 times per day. Some studies suggest that uncivil communication may have real consequences, including increased health problems due to stress, decreased work productivity, more auto accidents caused by aggressive driving, and vandalism.