Facebook gave iPhone users a major update to the app with better sharing settings. And this would not have happened had it not been for Google+. G+, while usage growth was not what it was in the first month, continues to grow and I predict it could have some effects on Facebook's iPO plans in 2012.
Right now, Facebook is facing some growing pains as it recently did away with its location-based function and deal services.
What the iPhone app is doing is catching up to G+ and allowing users to have access to what we've always wanted.
However, there is still their practice of using our information to augment their revenue. I'm hoping that Google+ will continue to grow and really hit Facebook where it hurts. In the end, it isn't about killing Facebook but killing off its privacy violating practices.