How Twitter reacted to Obama's speech on terrorism
US President Barack Obama has made a rare Oval Office address after the San Bernardino shootings that left 14 dead.
He said the killings were "an act of terrorism designed to kill innocent people".
He also warned that turning against America's Muslim communities would be exactly what Islamist extremists in the so-called Islamic State group want.
There was a mixed reaction to the speech on Twitter, as Ben Bland reports.