C&D for linking to peoples facebook photos on a website me and a friend started where we mined and crowd sourced personality information. Kind of BS seeing how open graph makes basic information about every user "public", but yeah, didn't feel like fighting this in court nor had enough revenue to do so. We were able to keep the site up and running once we stopped linking to photos, but it changed engagement and pageviews dropped from 20k per day to 2k and we didn't feel like rethinking things at that moment.
If I were to do it again, I'd mine VK, Sina weibo, and Naver, generate some revenue, then fight fb in court so we can link to facebook photos or incorperate from russia or china, and subcontract the tech out to US company.
Blog here about some things we were thinking about: http://pictobar.tumblr.com/
C&D here: https://www.chillingeffects.org/notices/2037976#