Enlarge / Tyler Droll, CEO of Yik Yak (L) and Brooks Buffington, COO, of Yik Yak, won the Fastest Rising Startup award at the TechCrunch 8th Annual Crunchies Awards at the Davies Symphony Hall on February 5, 2015 in San Francisco, California. (credit: Steve Jennings / Getty Images News) Well, it’s official. On Friday, the Yik Yak app officially closed up shop.