Image by Hamish Reid, Pandemonia Photography, London, England.
Images in social media have an implied license. For example, by creating a page you give an implied license for others to view and download. Implied license does not mean you can copy page. In the case of Facebook, you can share a photo through the "share" feature, but could not sell a photo found on social media.
Copyright for Educators and Librarians
Kevin Smith, MLS, JD; Lisa A. Macklin, MLS, JD; Anne Gilliand MLS, JD