Part of the problem is that there isn't really a cohesive community on something like Twitter. It's just a mass of people. For a group to be able to deal with b

Part of the problem is that there isn't really a cohesive community on something like Twitter. It's just a mass of people. For a group to be able to deal with bad actors, there needs to be something resembling a group boundary which can be policed and defended. Twitter lets anybody waltz into any conversation they want.