So you’ve been conscientiously adding copyright and contact information to all of your images as I suggested in the previous articles, but what happens to their metadata when you upload them to various photo sharing websites and social networks? Well, unfortunately not what you might expect, as this article on PetaPixel demonstrates.
Look at the chart below (source Embedded Metadata Manifesto):
Note that the row regarding Flickr is only valid for its free service. As far as I know, their pro service is much better in that respect.
Understandably, I much prefer sharing my photos on Google+ rather than Facebook.