This article examines how the link between two tragic events in Mexican historythe 2014 attack on students from the Ayotzinapa Teachers' College and the 1968 Tlatelolco massacre-has been represented and performed on Twitter, pursuing two interlinked objectives. The first goal is to explore the memorialization of the Tlatelolco massacre in relation to the Ayotzinapa case within a corpus of 16,706 tweets, showing how this memorialization has brought about a retemporalization of the history of violent acts committed by the state in Mexico. The second goal is to examine the role of Twitter as a mnemonic medium, considering it from both an ecological media perspective and an interdisciplinary research perspective that explores interconnections between media studies and memory studies.