In this article I discuss both the recent threats as well as opportunities posed by social media to the activities of museums, taking into account social media’s importance as an evolving space of both social outreach and social activism. Recalling the controversies around the U.S. and UK museums’ social media responses to George Floyd’s death, I argue that museums run the risk of politicization and entanglement in controversial issues which are not necessarily linked to their profile and mission. I analyse museums’ social media guidelines, good practices, and mission statements, and posit that they play a fundamental role in integrating the new realm of the Web 2.0 into traditional museum activities. My main case study and example of good practice is the Auschwitz-Birkenau Memorial and Museum. It has constantly embedded general ethical and educational principles and guidelines of Holocaust commemoration and education into its more than 60-years’ experience in dealing with and taming political and cultural controversies surrounding this memory site of universal importance, and this embeddedness lies at the core of its social media activity. Defined as an “online community of remembrance”, it consists of well-thought-out initiatives which aim at informing the public about the everyday history of the camp, involving itself in the current commemorations and anniversaries, and rectifying simplifications and misinformation about Auschwitz and the Holocaust. I also analyse the fundamental role played by the official social media profiles in managing the crisis which arose at the beginning of 2018 with the amendment of the socalled “Holocaust Law” in Poland.