Facebook offers all employees four months paid baby leave

"This expanded benefit primarily affects new fathers and people in same-sex relationships outside the US," wrote Lori Matloff Goler, Facebook's vice president of human resources, in a post Friday. "We want to be there for our people at all stages of life, and in particular we strive to be a leading place to work for families."

As one of the reasons for updating its parental leave policy, Facebook cited Pew Research that says half of fathers are worried that they don't spend enough time with their children.