500px, pronounced five hundred pixels, is an online photography community that was co-founded by Oleg Gutsol and Evgeny Tchebotarev (artistically also known as Ian Sobolev ). The Toronto based startup launched its Web 2.0 version in 2009 and is aimed at aspiring and professional photographers; encouraging members to upload their best work.
500px is seen as a place to gain exposure, find inspiration and connect photographers with one another. It hosts over 6 million photos and the most popular camera amongst its users is the Canon 5D Mark II.
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Evgeny Tchebotarev began 500px in 2003 within the social blogging website Livejournal, working on it as a hobby whilst he completed a business degree at Ryerson University. Back then, 500 pixels was considered a good size for web display and was therefore the limit placed on photos submitted for review to the community. Once photographers submitted their photos they were moderated and only those of a high quality would make it past the community s curators and be published onto the site.
Tchebotarev joined forces with Oleg Gutsol and in early 2009 they began work on the mostly automated incarnation of 500px. Image size grew to 900 pixels but the name remained. The two relaunched the site on October 31st, 2009. In February 2012 the site got another update with features called "flow", "stories", and "market".
In 2009, the site had 1000 users, purely through word of mouth. By late December 2011, the site had more than 290,000 users.
500px has an algorithm in place to allow recently uploaded photos of a high standard to be displayed at the forefront of the site. Views, votes, favourites and dislikes all contribute to a photo s rating or Pulse . The higher the Pulse the more likely it is to get to the Popular page and the higher the chance it has of being seen by other users. The algorithm allows all users, not just those with a following, to have a chance to get their work to the front page of the Popular photos, increasing exposure. The mathematical equations in place also take into account the freshness of an image with Likes/Dislikes counting for fewer points as they build up and the Pulse gradually decreasing with updates. This results in the Popular page always displaying fresh content and motivates users to regularly upload new images. Each user also has an overall rating titled Affection . Taking into account the likes and favourites they have received across all photos, it is a reliable indication of how popular a photographer is within the community.
Apps for iPad and Android were also made for the site.
On April 12th, 2012 500px s Terms of Service rose to the top of popular site Hacker News, garnering attention for displaying full-on lawyer speak on the left-hand side of the page and summing up the legalese into basic points on the right-hand side. The resulting discussion on the Terms was mixed, with positive feedback such as awesome  and one of the cleanest in the industry  alongside negative feedback that believes 500px may have put themselves at undue risk.
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