In October 2017, Vienna’s Leopoldstadt community succeeded in reinstalling a Hebrew street sign in a public space of the second district. This achievement became possible in large part due to the efforts of an active online community that encouraged many people to share their wish to have visible signs of the former historic Jewish quarter in the present urban space. Through vigorous Facebook and other social media activities, the interest that the group generated put pressure on the city, leading to the support of an art project. The placement of the Hebrew street sign marked a hybrid way of constructing Jewish urban spaces. The dialogue between virtual and physical spaces added new layers to the historic Jewish quarter of Vienna; this way of relational space making is, I wish to argue, paradigmatic for today’s Europe as it witnesses the heyday of Holocaust tourism and klezmer revivals. In this article, I investigate this space-making process in Jewish public history in present Vienna and examine how the virtual community frames the way urban Jewish spaces are constructed.