Zakin and Weisberg have found a huge following for their millennial, women-focused daily email newsletter. Covering everything from the presidential election to North Korean nuclear developments in a cheeky, irreverent voice, theSkimm has amassed more than 3.5 million subscribers, and recently raised $8 million in funding and launched its first product extension, an app that can integrate into your calendar. Next up: a new video venture, Skimm Studios.