In the hours following the wave of violence in Paris, many were left wondering whether their friends and family were hurt in the attacks.
One place thousands of people checked for information? Facebook. Parisians used the social network's "safety check" feature to let others know they were unharmed. Users with friends in Paris were notified of their status with a green checkmark.
"Quickly find and connect with friends in the area. Mark them safe if you know they're OK," the safety page reads.
Facebook rolled out the feature last year. The company has used the safety check during natural disasters, such as the deadly earthquake in Nepal in April,...