I have a Flickr account, and I do like it, looking for extra exposure, I did read 500px is owned by the Chinese, managed from Canada, different reports of how many uploads per week ( 7 or 20 ) but that number would not bother me though it would make getting started slower, Instagram is reportedly too vast of universe to make any impression there plus it supposedly is primarily video based on the reports I've found.
Still looking!
My Tumblr account has been terminated and so far I have not been able to discover why but I am now looking for another site to, primarily, display photos. Free is best though being able to sell a shot would be nice too.
I'm usually using details but reorganize as needed.