A free app that does nothing but trumpet Yo. at your contacts has found its way into the US App Stores Top 10 list, thanks to social medias irrepressible love for the inane. The attention even attracted $1 million in angel funding for Life Before Us LLC, the apps developer. According to The Financial Times, Moblis CEO Moshe Hogeg asked developer Or Arbel to design a one-button app so he could contact his assistant without the need for any extraneous effort.