1) Rec'd this link through our son this morning - interesting read. Dark Social: We Have the Whole History of the Web Wrong
I think this is the most important message:
"There are a couple of really interesting ramifications of this data. First, on the operational side, if you think optimizing your Facebook page and Tweets is "optimizing for social," you're only halfway (or maybe 30 percent) correct. The only real way to optimize for social spread is in the nature of the content itself. There's no way to game email or people's instant messages. There's no power users you can contact. There's no algorithms to understand. This is pure social, uncut."
2) This looks like it might have value: https://stipple.com//
P.S. Colby Brown has a series of article on social networking and photography. The latest is here:http://www.colbybrownphotography.com/social-media-for-photographers-facebook/
(but that's three things, so please, nobody notice...