Social media has become an important part of our lives with the widespread use of the internet. On Facebook, the largest social media platform, people with similar interests can establish a group and communicate with each other. There are Facebook collegial groups created by teachers in many countries. The research aims to identify the similarities and differences of science teachers' share content on Facebook groups. In the study, the case pattern was adopted which is one of the qualitative research methods. as a data source, two Facebook groups established by science teachers in Turkey and Europe which were determined through criteria sampling were analyzed for one-month shares. 341 posts of science teachers' group in Turkey were analyzed by analysis method, 396 posts in Europe were subjected to descriptive analysis. Analysis results are presented in tables and compared. Based on the research results we can say science teachers in Turkey focus on course content while the ones in Europe are more interested in professional and personal development, scientific developments, and academic activities. The research results were compared with the education systems of countries, teacher training policies, and other studies in the field, and various suggestions were made. [This article was presented as a summary at the International Conference on Science, Mathematics, Entrepreneurship and Technology Education (2nd, November 19-22, 2020).]