NotificatorFig. – For a small sum Londoners may leave messages for friends in public spaces. When writing on “notificator” messages moves up behind window, remaining in view for two hours.  Known as the “notificator,” the new machine was installed in streets, stores, railroad stations or other public places where individuals may leave messages for friends. Appeared in the American Modern Mechanix magazine (August, 1935) (via Modern Mechanix blog) + Maikelnai’s blog).

World’s first Twitter? Hell no! First World Twitter is kind of old, … it were Public Bathrooms !! As well as Hobo signs.