Among the most chilling details to emerge in the Orlando massacre is that the killer paused during his three-hour rampage at the Pulse nightclub to search Facebook for news about it.
“Pulse Orlando” and “shooting,” Omar Mateen typed into his smartphone, investigators found.
His real-time search is a striking data point in what has become a pattern in mass shootings: Killers deeply attuned to their media coverage and in some cases engineering it.
The 2007 Virginia Tech shooter interrupted his killing spree to mail a videotape to NBC to claim credit and explain his motives. The 2014 Isla Vista killer posted a manifesto on YouTube. Others have...