Add Hangouts to the discussion. They incorporated SMS into the app, but the implementation doesn't look complete/polished, let alone the app. So, it doesn't provide me an alternative to the OEM provided messaging app, and at the same time they are accessing my SMS messages.

I personally don't use Facebook on phone now, but I would recommend using a third-party app for accessing Facebook on android. I have used Friendcaster, Fast and Seesmic before and found them pretty decent.