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Because of the massive traction it has achieved in recent months, it is no longer possible to regard 500px as a niche service for fine art photographers, but rather, a legit rival to photo sharing giants such as Instagram and Flickr.
Toronto’s 500px graduates from niche player to legit Flickr/Instagram rival

Toronto’s 500px has long cultivated a reputation as a more highbrow competitor to its photo-sharing cousins Flickr and Instagram. And...