Firstly, not all of such content is banned by Twitter, even though the platform prohibits threats, posting confidential information and abuse, including "promoting violence" against people or groups. Submitting a report, again, is not always straightforward.
The study notes that first-time users may not send vital things like a tweet's web address. Others might need a way to make clear that one person is harassing them from several different accounts, making a new one each time the old one is banned. While Twitter can always suspend accounts, it might not always be the best strategy. If the tweets are actually illegal, a suspended account means users cannot show messages to law enforcement, the report said. WAM found that one of its best tools was simply communicating with people who reported harassment to figure out the larger context behind a reported tweet or account. One of the solutions that WAM has suggested is to opt for filters that people could turn on to limit what they receive.