The first thing needs to be a culture change: "move fast and break things" is not an acceptable philosophy when you're dealing with millions of people's private conversations.
OP here. I work at a company that is able to move quickly, and yes, sometimes breaks things in the process. Tradeoffs between speed and safety are fine to make, in my opinion. It does seem like it would be useful to regulate things like ethical conduct, though. Maybe this dictates what systems are ok to move quickly and break and which systems aren't. What do you think?