User blog comment:Rappy 4187/Technical Update: April 15, 2015/@comment-1251315-20150416123403/@comment-957747-20150427210958

We added CSS in a rollout that should have went with the release of the Social Icons. The Social Icons were delayed, but the CSS went out anyways. Tomorrow, we're releasing the Social Icons, so the CSS that was for it will show the header as you'd expect.

edit: I read your original post wrong.