The article title is link bait. The article is about Gravatar, and GitHub only matters because it utilizes Gravatar. (Your email address may be visible in all

The article title is link bait. The article is about Gravatar, and GitHub only matters because it utilizes Gravatar. (Your email address may be visible in all sorts of other ways on GitHub, such as when someone does git log on a public git repository.) If you're worried about your Gravatar being matched to your inflammatory (i.e., trolling) Hacker News or WordPress comments, you probably should be using a separate email account and Tor and whatnot.