When people post something on social media platforms, such as whatsapp, facebook, can we take a sanpshot and share it? Or do we need to seek permission to do so? eg; someone posts whatsapp status or whatsapp display picture of a doa or quote, can we save and send it to people? Or can we ourselfves use it for our benefit since it's kind of public? Or do we need to ask permission every single time?

If it’s a private group, and generally the people in that group do not want anything shared, then you should not share. It depends on the setting, some Facebook accounts are set as public so it’s ok to share etc. If people have placed setting as public then it’s ok to share. Otherwise we should ask permission as much as possible