GitHub is an awesome way to manage code, but its usefulness doesn't end there. If you want to pursue a career as a developer, it's a vital way of demonstrating your skills.
Recruiter Shon Burton points out that GitHub is a developer-specific example of a more important general career principle: employers will examine your online activity, social or otherwise, to help determine whether to hire you. It's particularly relevant if you want to work for major software companies:
Today it's much harder to get hired as a software engineer at Google or Apple or Twitter if you haven't been sharing your work on a site like GitHub. That's a huge change from five years ago. Hiring managers will literally say, 'No GitHub? What's wrong with this picture?'
Hit the full post for more discussion of how to promote yourself online.
Here's How A CEO Evaluates Job Candidates On Social Media [Business Insider]