Twitter has made changes to the “Twitter Rules” that dictate how people are allowed to use its service as part of its efforts to curb abuse on the platform. Former chief executive Dick Costolo recognized Twitter’s abuse problem in February. Since then, the company has devoted more staff to moderating its service, introduced new harassment reporting tools, and taken steps to limit abusers’ ability to spew filth at their target from numerous Twitter accounts. Now the company has updated the Twitter Rules to make its stance on abuse even clearer.