In the sharing economy, people increasingly rely on online and often anonymous reviews from others on where to stay, eat, shop and more. They are willing to trust suggestions from strangers because this practice offers convenience and the comfort of multiple, varied experiences.

Still, the review system depends on the unspoken expectation that everyone involved is writing truthfully. That comes to a head when safety and security is threatened. Whose responsibility is it to ensure that people see information about unsafe places? How can the information in reviews best be vetted?