Michelle Phan knows a thing or two about making a fun and profitable YouTube channel--and turning viral hits into a long-term business strategy. The 29-year-old entrepreneur is among the highest-grossing celebrities on YouTube, pulling in roughly $3 million in ad revenue through the social network, where she posts makeup tutorials to her more than eight million viewers.
Phan's channel has amassed over one billion views to date. She's also parlayed her social media fame into a beauty subscription service, called Ipsy.