Task: Question Understanding
Input (English): The National Gang Threat Assessment Report confirms that at least tens of thousands of gang members are using social networking websites such as Twitter and video sharing websites such as YouTube in their daily life BIBREF0 . They are very active online; the 2007 National Assessment Center's survey of gang members found that 25% of individuals in gangs use the Internet for at least 4 hours a week BIBREF4 . 
 Question: Do the authors provide evidence that 'most' street gang members use Twitter to intimidate others?
Output (English): Yes-no