When Google CEO Eric Schmidt stepped down from his role and handed the reins back to co-founder Larry Page, he explained it thus: “Day-to-day adult supervision no longer needed!” It was a reference to a wider trend in Silicon Valley of pairing young, inexperienced tech founders with more experienced business execs to help a company grow. Sheryl Sandberg has fulfilled a similar role at Facebook for its CEO Mark Zuckerberg. Now Snapchat is getting an adult in to help its (young, inexperienced, tech) founders grow – and it’s poached her from a direct rival. Emily White has been the executive in charge of business development at Instagram, but she’s joining Snapchat as chief operating officer. The photo and video-sharing app has been reportedly turning down multibillion-dollar acquisition offers from the likes of Facebook and Google, but has yet to make any revenues. White’s job is to help it on the latter front, just as she was helping Instagram. “It happened really quickly, but to have an actual COO role in one of many companies that is disrupting the communications arena is one I could not pass up,” White told All Things Digital, which broke the news.