F3 develops a social app for asking questions and creating answers, with all content disappearing in 72 hours. Founded by Girts Tihomirovs, Ilja Terebin, and Mark Terebin in 2018, F3 is backed by investors that include Mail.Ru Group, AdFirst.vc, Mamba, Marat Kichikov, and Alex Hofmann and is headquartered in Riga.