evidence: Joint actions must be well coordinated and have clear objectives, otherwise they can lead to disagreements between players. For example, Facebook’s fact-checking program has sparked skepticism from partner organizations. The criticisms range from the terminology and categories used by the social network to rank disinformation to concerns regarding transparency on the impact of the fact-checking that independent checkers do [129]. Full Fact, an independent partner in Facebook’s project, published a report asking for answers to questions such as "Does the notification stop many people from sharing?" and "What percentage of people who view a post we have rated click on our fact check beneath it?" [130]. The same questions prompted Snopes, a US-based fact-checking agency, to end the partnership with Facebook [131]. [...] Ingram, M. (2019). Facebook’s fact-checking program falls short. The Media Today. https://www.cjr.org/the_media_today/facebook-fact-checking.php. Accessed 15 Jan 2021. (2019). Report on the Facebook Third Party Fact Checking programme. Technical report. https://fullfact.org/media/uploads/tpfc-q1q2-2019.pdf.