"We suck at dealing with abuse and trolls on the platform and we've sucked at it for years," said former Twitter CEO Dick Costolo in a leaked 2015 memo.

"It's no secret and the rest of the world talks about it every day," he continued. "We lose core user after core user by not addressing simple trolling issues that they face every day."

It was a surprising admission about one of the service's biggest flaws. On Twitter, sharing other users' posts as easy as a single touch, but that also creates the opportunity for regular people going about their day on Twitter to wind up the target of harassment from thousands of other users at a moment's notice.

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