In this study, we examined 6 Science Centers' (SC) social media efficiencies established with the support of TUBITAK during the Covid-19 pandemic process. During the pandemic period, because the SCs were closed to visit, they became active on their social media accounts. Therefore, within the scope of the research, we have analyzed the posts made by the SCs through Facebook and Instagram and the interactions they have received as a result of these posts. We have given the BMi, BM2, BM3, BM4, BM5 and BM6 codes to the SCs that are the subject of the research, without considering any order. We used both qualitative and quantitative analysis methods in the research. Within the scope of qualitative analysis, we searched social media accounts via search engine Google and categorically analyzed all the posts of the SCs between January 01 - May 19, 2020. As of January 01, we accepted every 7-day period as a week and accordingly examined 20 weeks. This period includes 10 weeks before and after 10 March 2020, the date when the Covid-19 pandemic was first seen in Turkey. We categorized interactions as likes, comments, shares for Facebook and likes and comments for Instagram. As part of quantitative research, we used the Data Envelopment Analysis (DEA) developed to measure the effectiveness of similar units relatively. With this method, we analyzed the social media activities of SCs, which are accepted as an out-of-school learning environment, before and after Covid-19. We observed that efficiencies showed a significant change in relation to the pandemic according to the SC's sharing status.