August 3, 2014 | The Israeli application that allows you to send ‘Yo!‘ to your friends has released a new service called Yo Lineup. The Yo Lineup tool allows doctors’ offices and restaurants to handle queues, letting those in the waiting room or restaurant lobby know when it’s time for their doctor’s appointment or to sit down at their table. The app lets them know by sending a ‘Yo’ to their smartphones. However, in order to use Yo’s Lineup feature, users must already have a Yo app and account up and running on their smartphone. Yo is an messaging app that was released only two months ago, invented by Mobli CEO Moshe Hogeg and Yo CEO Or Arbel.