a certain day or period (often somehow related to the day of tweet posting), or unspecified entities, such as #todaywe remember, #otd, #onthisday, #4yearsago and #rememberthem. Historical Events hashtags related to particular events in the past (e.g., #wwi, #sevenyearswar). Historical Entities hashtags denoting references to specific entities such as persons, organizations or objects (e.g., #stalin, #). See also Collective consciousness Collective intelligence Collective unconscious Cultural memory Digital preservation, Web archiving Distributed cognition Les Lieux de Mémoire Meme National memory Oral history Selective omission – biases to taboo some elements of a collective memory References Further reading General studies Jan Assmann: Religion and Cultural Memory: Ten Studies, Stanford UP 2005 Jeffrey Andrew Barash, Collective Memory and the Historical Past, Chicago and London, University of Chicago Press, 2016. Maurice Halbwachs: On Collective Memory, Univ of Chicago Press, 1992, Pennebaker, James W. Paez, Dario. Rime, Bernard: Collective memory of political events : social psychological perspectives, Mahwah, New Jersey. Lawrence Erlbaum Associates: 1997. Amy Corning & Howard Schuman: Generations and Collective Memory, Chicago: University of Chicago Press, 2015. Case studies Bayer, Yaakov M. (2016). Memory and belonging: The social construction of a collective memory during the intercultural transition of immigrants from Argentina in Israel. Journal of Multidisciplinary Research, 8(1), 5-27. Cole, Jennifer: Forget colonialism? : sacrifice and the art of memory in Madagascar, Berkeley [etc.] : Univ. of California Press, 2001 Fitsch, Matthias: The Promise of Memory: History and Politics in Marx, Benjamin, and Derrida, State University of New York Press, 2006 Lipsitz, George: Time Passages : Collective Memory and American Popular Culture, Minneapolis. University of Minnesota Press: 2001. Neal, Arthur G.: National Trauma and Collective Memory: Major Events in the American Century. Armonk, N.Y. M.E. Sharpe: 1998 Olick, Jeffrey K.: The Politics of Regret: On Collective Memory and Historical Responsibility, Routledge, 2007 Olick, Jeffrey K.: In the House of the Hangman: The Agonies of German Defeat,1943-1949, University of Chicago Press, 2005. Tillack-Graf, Anne-Kathleen (2012): Erinnerungspolitik der DDR. Dargestellt an der Berichterstattung der Tageszeitung „Neues Deutschland“ über die Nationalen Mahn- und Gedenkstätten Buchenwald, Ravensbrück und Sachsenhausen. Frankfurt am Main: Peter Lang. ISBN 978-3-631-63678-7. Handbooks Olick, Jeffrey K., Vered Vinitzky-Seroussi, and Daniel Levy, eds. The Collective Memory Reader. Oxford University Press: 2011. Prucha, Francis Paul. Handbook for Research in American History: A Guide to Bibliographies and Other Reference Works. University of Nebraska Press: 1987 Encyclopedia of American Social History. Ed. Mary Clayton et al. 3