Duolingo’s social media coordinator on their big green owl, the “Wendy’s effect” and changing the voice of brands online.

Olympians, including Thompson-Herah, are sidestepping the rules by sharing behind-the-scenes content and more personal videos.

"As influencers, we are walking ad space," Troy Solomon says.

New York Times reporter Nick Confessore tells how many celebrities have bought their followers from a company called Devumi.