Twitter is taking steps to correct its harassment problem, at least where Leslie Jones is concerned. CEO Jack Dorsey tweeted the Ghostbusters star , telling her to DM him so they could take steps to rectify the widespread and frankly disturbing abuse she received Monday. Those steps include permanently banning Breitbart Tech Editor Milo Yiannopo lous for his role in leading the campaign against Jones.The company made it clear that it wouldn't continue to tolerate this abuse moving forward. Twitter released the following statement to Buzzfeed on the ban, and their harassment issue."People should be able to express diverse opinions and beliefs on Twitter. But no one deserves to be subjected to targeted abuse online, and our rules prohibit inciting or engaging in the targeted abuse or harassment of others. Over the past 48 hours in particular, we’ve seen an uptick in the number of accounts violating these policies and have taken enforcement actions against these accounts, ranging from warnings that also require the deletion of Tweets violating our policies to permanent suspension."We know many people believe we have not done enough to curb this type of behavior on Twitter. We agree. We are continuing to invest heavily in improving our tools and enforcement systems to better allow us to identify and take faster action on abuse as it’s happening and prevent repeat offenders. We have been in the process of reviewing our hateful conduct policy to prohibit additional types of abusive behavior and allow more types of reporting, with the goal of reducing the burden on the person being targeted. We’ll provide more details on those changes in the coming weeks."Twitter has come under criticism for its response to Jones' harassment. Instagram, by contrast, quickly moved to curb negative comments on Taylor Swift's posts. It's worth noting that unlike Instagram, Twitter is notoriously averse to silencing even the most negative voices on its platform, except when they're reported by users. Harassment is a major problem that the company has yet to fully solve.