As a little hack on the weekend, I started playing with the Github API, after using it for more serious purposes in toolshelf. The result was
which turns Github into a computer dating service. Well, not really, and I really can't recommend using Github for romance...
...but the script does try to find Github users who have tastes that are similar to those to a given user, based on the starred repositories they have in common. And while it's very crude metric, I did end up finding a few users with it whose interests seem broadly similar to my own, who I have since started following.
(And I suppose that it's a coincidence that just as I was about to write this announcement, the BBC ran this article?)