In April, GitHub announced its second annual data challenge, which saw a significant increase in public timeline data, including millions of new repositories, pushes, and comments. The 2013 challenge attracted numerous innovative entries, with GitHub employees voting to select the top three. First place went to Dan Foreman-Mackey for his Open Source Report Card, which analyzes a GitHub user's contributions to generate a detailed report. Second place was awarded to Outsider for Popular Convention, an analysis of programming conventions like tab versus space usage. Third place went to David Fischer's visualization of open-source contributions by geographic location. The winners received gift certificates, and GitHub expressed excitement for future challenges.