[Dewie]

One possible solution might be to only let people that have registered with their real name report abuse easily, and they can report anyone (real name or not). These are the people who people can easily track down, so death threats are much more frightening to receive for these people. They will probably abuse the report function less since they feel like they are interacting in an open public space with their real identity, and I guess they might be easier to ban from the service if they abuse it.

The problem would be to find out who is actually registering with real names, but I think Facebook have done this for a while now. It shouldn't be a problem for people that are a bit famous, and with the lopsided amount of people on Twitter that are followed compared to the whole userbase, I guess it might mostly be decently famous people that would have the want or need to register with their real names.