Read up on it here. This is also why it didn't display an accurate number of followers anymore, and the number of followers was going down rather than up as they removed non-Google accounts.
I have therefore removed the Google Friend Connect gadget from my blog as it's no longer useful. If you've been using Google Friend Connect, please create a Google account if you haven't already done so, and refollow my blog. Or sign up via email, or follow however else works for you. Thanks much!