84. Bart Stein and Nick Meyer

Cofounders, Sup

Sup, a messaging app that lets you share 10 seconds of video streaming at a time with your friends, is the brainchild of two former Yahoo employees, Nick Meyer and Bart Stein.

Stein had previously developed Stamped, the first acquisition Yahoo CEO Marissa Mayer made, and helped lead Yahoo's New York product office. One year after Meyer's frequent-flyer company Milewise was acquired by Yahoo, he and Stein left to found Sup.

Sup raised a seed round of $1.5 million from Keith Rabois at Khosla Ventures. Fun fact: Rabois tried to acquire Stamped when he was an executive at Square, but Stein chose to get acquired by Yahoo instead.