Hello. Unfortunately, you did not inform the article to which this question is related, which makes it impossible for it to be answered. However, I will try to help you in the best possible way.
With the phrase "think before you post" we can consider that the author is referring to the attitude of people within social networks. In this case, we can consider that he is referring to the exaggerated exposure, conflict creation, cyberbullying and misinformation that people share on the internet without considering the problems that these posts can cause for themselves and for others around the world. In other words, the author may be stating that before posting something, we should think about the consequences that posting can cause and how it can affect someone in a very negative way.
