@Wiggin : I don't think masks should be seen as replacement. But if there is a chance that a mask on your face keeps me a little bit safer, then I see no reason not to use them.

@Loki : interestingly the people who wear them are benefitting the least.

@Enoch: the notion that you need to be a professional to wear a facemask that essentially is there to protect others is mixing up the uses facemasks can have. If I get on the metro tomorrow I have to wear one. I do not have any illusions that it (medical grade surgical mask) is going to keep me safe.