But this is only the latest in a long list of events that has flooded twitter with useless/false/panicky/retarded comments. Do they censor/moderate all stories?

But this is only the latest in a long list of events that has flooded twitter with useless/false/panicky/retarded comments. Do they censor/moderate all stories? Or none? It seems hard to draw a line in between (blatant illegality aside)...