500px has been taking off in the photographer community lately, though they're nowhere near feature-parity with either Flickr or Smugmug.
No geotagging, not even API access, makes the use cases somewhat limited. But what is there is impressive, and the general caliber of work on 500px is higher than Smugmug, and a lot higher than Flickr.
I do find the discoverability features somewhat annoying due to the userbase they bootstrapped with. With Flickr Explore you'll find some puzzlingly banal photos making it to the top. With 500px's "most popular" galleries you'll just find a lot of nudes. It's like nothing else on that site gets any hope of rising to the top if it doesn't slip a nipple.
500px feels like it's evolved a culture that values very carefully curating your photos and posting only your very best to 500px itself; the expectation seems to be that the bulk of your work will end up on ${SOME_OTHER_SITE}. People seem prolific if they have 50 pictures up on 500px; I don't think I've seen anyone with 100.
It can be a great adjunct to a Flickr replacement, but unless the usage patterns change radically, it won't be that replacement itself.
> With 500px's "most popular" galleries you'll
> just find a lot of nudes. It's like nothing
> else on that site gets any hope of rising to
> the top if it doesn't slip a nipple.
Really? I'm not seeing any nudes[1]. Am I looking at something different?
With Flickr going downhill, what should I switch from SmugMug to?