It looks more likely that someone's learning Go and going through the crawler example in the tutorials. Of course I may be wrong here. The trigger for me was the term "Fetcher" here.. http://tour.golang.org/#73 Fun exercise though.
As a former employee, that was my first thought when I read the post too. Every once in a while, I would stay late there and work on a little personal project for fun there. Sometimes one of my friends would be working late, and I'd just keep him/her company. After all, if I'm just going to do the same thing at home, I might as well take advantage of coding on my big monitor and comfy chair...