Looks like the female Facebook icons have been reading 'Lean In.'

"How old were we in that picture? I can't believe that's how we used to look!"
(via Sheryl Sandberg)

You might not have ever really thought about it, but in this silhouette that we all see on Facebook constantly, the guy is totally overshadowing the woman. (And we can't hear what they're saying but he's probably interrupting her, too.)

A designer at Facebook, Caitlin Winner, realized that this common icon sends iffy messages about gender, so she created a new icon to promote equality. COO Sheryl Sandberg explained the update in a Facebook post (obviously):

Sources: Sheryl Sandberg | Medium