Since that thread got closed:
Quote:
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Internet users often automatically grant a website permission to use a photograph by agreeing to the website’s terms of use. The terms of use for social networking and photo-sharing websites such as Facebook or Flickr for example, usually grant the website a non-exclusive license to use uploaded photographs but not further permission for other website users to distribute them.
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Source:
https://cippic.ca/en/FAQ/Photography_Law
209x50 is the owner of the image, no matter where he uploads it he stays the owner and third parties need his permission to use it online, not just if they want to use it commercially. Sharing his post with the image on facebook (which always includes a link to his original post) is a completely different thing than downloading the image and then sharing it using an external provider. Technically and legally.