"There is trust and safety, and payments and reputation.
When this fails and redditors break the rules, trust and safety punishes them.
"We've done work in customer support, trust and safety and different pricing scenarios, which we continue to test".
Shuman Ghosemajumder, Google's business product manager for trust and safety, said a company's search provider should do the sleuthing.
Alex Macgillivray, Twitter's general counsel on policy, trust and safety, said on his company's service that this was a "bad day for the Internet".
No one opposes strong consumer privacy protections, least of all digital media businesses that depend on consumer trust and safety for their livelihood.
Its head of trust and safety, Kira O'Connor, said: "Hateful conduct has no place on the Twitter platform and is a violation of our terms of service.
"Whatever we do elsewhere to assure trust and safety, in China we have to do more," Ms. Whitman said during an interview on a trip to Europe.
But even sites that enjoy a brief rise in traffic due to abuse are damaged in the long run, says Catherine Teitelbaum, chief trust and safety officer for ASKfm.
Del Harvey, Twitter's director for trust and safety, admitted it was not the company's policy to automatically report threatening or abusive messages to police.
