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Re:Free Github SSH keys anyone? by teilo on Thursday January 24, 2013 @03:29PM (#5111995)
In all likelihood, these are NOT the user's private SSH keys, but a key generated for the service that the user is developing - such as a key to run backups and issue remote commands. Thus I can well see that the key could be committed as part of an application stack.
Re:Free Github SSH keys anyone? by mkhattab on Thursday January 24, 2013 @03:33PM (#5112030)
No, some of these repositories are user's dotfiles. See this for example, https://github.com/gomachan/dotfiles

There are many examples like this.