Unless everyone who posted #printcave pictures explicitly allows you to use their pic on your site, i’d be treading very, very carefully. An Abmahnung for copyright infringement will cost you a couple hundred of Euros, at least (+ another 300 to 500€ for the lawyer).
Thx guys, will not publish stuff without having a license - i <3 Creative Commons and will simply rewrite my API-Foo to only read the stuff of people that allowed me to use theirs.
We need a License for G+ Contents - that would be killer
I’m fine with it as well (which was the meaning of my +1 before).
And my honest and very personal opinion on this is:
We’re all good people, nobody is suing you.
If you always apply thinking like @Thomas_Sanladerer (No offense at all! You’re right - I know that :)) you will never do business nor have fun nor live.
Go for it and appreciate the time you’ve put into the code.