Awash in social media, how are police learning to inform the public better after shootings?

Jennifer Seeley leaves a message on a cross that has the name of security guard Christian LaCour, written on it at a makeshift memorial in Allen, Texas. — AP

Jennifer Seeley was glued to her phone, safe at home but terrified nonetheless.

There was an active shooter at the Texas mall where she works as an assistant store manager. And she was searching desperately for information, praying. Was the gunman dead? Were her coworkers dead? What was happening?