As of writing, the Google+Facebook team is doing the best they can to restore their G+ extension's service.
Although, really, I'm not too optimistic they'd get it back to working the way it was.
Yesterday, Facebook altogether blocked Google+Facebook's access to FB's servers -- rendering it, well, useless (that is, as if it never existed). Note, however, that Facebook isn't singling out the extension. The truth is, Facebook is no longer enabling communication with the whole of Google Plus.
For those who are not familiar with Google+Facebook, when it was still working, it allowed G+ users to update FB status message and view status updates from Facebook friends right from Google Plus.
The fight is on! To arms!