Avi Lieberman, the founder of Pattr (Courtesy) Lieberman believes many social media platforms are missing a feature that would let users expand outside their network and let strangers meet to talk about topics of mutual interest. “A lot of that was just missing from everything that was called social media,” Lieberman said. “And I realized that this is a problem that needed to be solved.” The solution, Lieberman decided, is an app he called Pattr. Designed for all ages, Pattr is a social media app based solely on three kinds of phone conversations: group calls; public squares, where users can meet and converse with strangers who have similar interests; and one-on-one phone calls.