It could be explained by the herd mentality. An angry man alone would probably not throw stones in the street with his face uncovered; But he would probably do

It could be explained by the herd mentality. An angry man alone would probably not throw stones in the street with his face uncovered; But he would probably do so in a riot. Now, in social networks, is quite easy to simulate persons and have them starting a riot. Having a way to identify real persons could make this more difficult.