I've gotta say, the G+ iOS app shits all over the FB app now that they abandoned the browser in an app concept. It's all native obj-c now and it's smooth as hell compared to the shittastic FB UIWebView wrapper app. Shame that no one uses it.
anecdotal:
The few members of my family, on iPhones, that had previously set up an account (and did not do much with it) are pretty active now after the update.
The Facebook app just pisses me to no end. Just use their mobile site and keep Messenger install.