"Sorry for turning Twitter from nurturing paradise into a place that has… trolls," he said in one tweet, posting a screengrab of the report. This matches up with what current and former employees at Twitter told me about how features - like the "harmful reply nudge", intended to protect Twitter users from trolling and harassment - are proving difficult to maintain and are working inconsistently. Twitter policies, which are publicly available online, say that "defending and respecting the user's voice" remains one of its "core values"