Well, the greatest photographers are sent by magazines like national geographic for reportages, then they earn their money through stock agencies like Getty, or photo workshops around the world. For instance Wolfe, Frans Lanting and Jack Dykinga will all go together to the Falklands late this year to bring people to take pictures of the birds and animals. That’s their biggest income. You can find free download of the same images posted here even on Art Wolfe website, because with that resolution you can print a A4 size paper, not more. It’s the same with music or ebooks: if someone wants to download your work for free he or she is not a customer anyway. So you can let them do it unless it’s for commercial porpoise. I think it’s good anyway for people to know about the work of a great artist even through a social network platform, expecially in fields like photography that are not at the top of the list as interest for many.