Facebook’s growing power over the public square is back in the news this week as the company announced it is banning the promotion of certain kinds of back-to-work protest events on its platform. While the company’s previous bans have largely focused on blocking digital speech it finds objectionable, the move to thwart protests in the physical world underscores just how central the social media giant has become to the expression of democracy and just how much power it now wields over even our physical lives.