|This article relies on references to primary sources. (April 2011)|
The GitHub logo
|Slogan||Social Coding (for all)|
|Type of site||Collaborative revision control|
|Registration||Optional (required for creating and joining projects)|
|Alexa rank||183 (April 2014[update])|
GitHub is a web-based hosting service for software development projects that use the Git revision control system. GitHub offers both paid plans for private repositories, and free accounts for open source projects. The site was launched in 2008 by Tom Preston-Werner, Chris Wanstrath, and PJ Hyett.
The site provides social networking functionality such as feeds, followers, wikis (using gollum Wiki software) and the social network graph to display how developers work on their versions of a repository.
GitHub also operates other services: a pastebin-style site called Gist that provides wikis for individual repositories and web pages that can be edited through a Git repository, a slide hosting service called Speaker Deck, and a web analytics platform called Gauges.
In a talk at Yahoo! headquarters on 24 February 2009, GitHub team members announced that during the first year that GitHub was online, it accumulated 46,000 public repositories, 17,000 of them in the previous month alone. At that time, about 6,200 repositories had been forked at least once and 4,600 merged. On 5 July 2009, a Github Blog post announced they reached the 100,000 users mark.
In another talk delivered at Yahoo! on 27 July 2009, Tom Preston-Werner announced that the numbers had risen to 90,000 unique public repositories, 12,000 having been forked at least once, for a total of 135,000 repositories. In July 2010, GitHub announced that it hosts 1 million repositories. In April 2011, GitHub announced that it is hosting 2 million repositories.
On 21 September 2011, GitHub announced it had reached over 1 million users.
On 13 September 2012, on their homepage, GitHub announced it had over 2.1 million users hosting over 3.7 million repositories.
On 19 December 2012, GitHub announced it had over 2.8 million users hosting over 4.6 million repositories 
On 16 January 2013, GitHub announced it had passed the 3 million users mark and was then hosting more than 5 million repositories.
On 10 April 2013, GitHub announced it had 3.5 million users and was now hosting more than 6 million repositories.
On 23 December 2013, GitHub announced it had reached 10 million repositories.
Limitations and constraints
According to the terms of service, if an account's bandwidth usage significantly exceeds the average of other GitHub customers, the account's file hosting service may be immediately disabled or throttled until bandwidth consumption is reduced. In addition, while there is no hard limit, the guideline for the maximum size of a repository is one gigabyte. Also, there is a check for files larger than 100MB in a push; if any such files exist, the push will be rejected.
On February 15, 2013, GitHub released Boxen, an open source Mac environment automation tool.
GitHub also has their standard GUI application available for download (for Windows and Mac only) directly from the service's website, and provides an open source Android app on Google Play.
GitHub, Inc. was founded in 2008 and is based in San Francisco, California.
Peter Levine, general partner at GitHub's investor Andreessen Horowitz, stated that as of July 2012, GitHub had been growing revenue at 300% annually since 2008 "profitably nearly the entire way". GitHub offers private code hosting starting at $7/month for five repositories, up to $200/month for 125 repositories. Instances of GitHub can be licensed to run on private servers inside a company's firewall under the Enterprise plans ($5000/year/20 seats). Another revenue stream is GitHub Jobs where employers can post job offers for $450/listing. GitHub's salespeople are not paid on a commission basis.
GitHub, Inc. is a flat organization with no middle managers; in other words, "everyone is a manager" (self-management). Employees can choose to work on projects that interest them (open allocation). However, salaries are set by the chief executive, Tom Preston-Werner.
Allegations of harassment and departure of an employee
In March 2014 a former female lead developer, Julie Ann Horvath, suggested a discriminatory environment at GitHub. In an interview to TechCrunch she complained about the start-up's culture, leaving the firm after repeated harassment from a (at first not publicly identified) founder's non-employee wife and witnessing male co-workers "gawking" at some female co-workers who were hula-hooping. GitHub CEO and cofounder Chris Wanstrath issued a statement personally apologizing to Horvath and noting that the relevant founder had been put on leave and his wife was no longer permitted in the office. On March 17, Gawker reported that the unidentified married couple were co-founder Tom Preston-Werner and his wife Theresa. 
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