Looking at the news, you might have observed how it looks like in some areas, almost everyone is wearing a face mask. This might be what has inspired the current buying spree with people cleaning out the shelves from face masks quicker than they can be stocked.
What are the benefits of wearing a face mask? For the general public, not many. COVID-19 is not an airborne virus. In fact, the droplet containing the virus will fall down on the ground very quickly. The problem when people are wearing a mask is that they are lulled into a false sense of security, possibly exposing themselves by other means. Just the fact that a face mask is restrictive and uncomfortable to wear causes people to constantly adjusting it, and if their hands are contaminated, this could expose them to the virus. Many also don the mask the wrong way, so that it is leaking around the edge. Unless you are sick or caring for elderly ones, you are better off just practicing social distancing.