These proceedings represent the work of contributors to the 8th European Conference on Social Media (ECSM 2021), hosted by UCLan Cyprus, Larnaca on 1-2 July 2021. The Conference and Programme Chair is Dr Christos Karpasitis, University of Central Lancashire - Cyprus (UCLan Cyprus).ECSM is now a well-established event on the academic research calendar and now in its 8th year the key aim remains the opportunity for participants to share ideas and meet the people who hold them. The conference was due to be held at UCLan Cyprus, Larnaca but due to the global Covid-19 pandemic it was moved online to be held as a virtual event. The scope of papers will ensure an interesting two days. The subjects covered illustrate the wide range of topics that fall into this important and ever-growing area of research.The opening keynote presentation is given by Dr Nikolaos Dimitriadis, Optimal HR Group, Athens, Greece on the topic of Our Brains on Social: Neuro Research Insights on Social Media Usage. On the second day, Mr Nicolas Ioannides, Influencer of the Year - 2018, TV-host and content creator from Nicosia, Cyprus will give a talk on the subject: Influencer Marketing. With an initial submission of 100 abstracts, after the double blind, peer review process there are 31 Academic research papers, 3 PhD research papers and 2 work-in-progress papers published in these Conference Proceedings. These papers represent research from Australia, Austria, China, Cyprus, Czech Republic, Germany, Italy, Lithuania, Malaysia, Netherlands, New Zealand, Northern Cyprus, Portugal, Russia, South Africa, Spain, Switzerland, UK, United Arab Emirates, and USA.