Millennials are shaking up these 7 industries

Whitney Wolfe Herd is the 28-year-old founder and CEO of Bumble, a dating app where women initiate the first conversation.

Female users have 24 hours to make the first move or the match will disappear.

"The idea was to give women the control to guide the conversation in the direction they wanted," Wolfe Herd said.

She started the app after being harassed online. Previously, Wolfe Herd was a cofounder of dating app Tinder, but left and filed a sexual harassment suit against the company.

"You have to start a business to solve something that's a personal pain point. That's where the best businesses come from," she said.

Bumble, which launched in 2014, now has about 20 million users worldwide.