A demo booth at Facebook's annual F8 developer conference, Tuesday, April 18, 2017. CEO Mark Zuckerberg addressed recent violence on Facebook at the conference.(Photo: AP Photo/Noah Berger)SAN FRANCISCO — A distraught father in Thailand killed his 11-month-old child on Facebook Live, the latest in a string of disturbing incidents including suicide, torture and sexual assault that have reached millions on the live-streaming service, raising questions about Facebook's ability [...]