I think it has to do with how each is used. Facebook has positioned itself as a social space to facilitate socialization with others of your choosing. Then fr

I think it has to do with how each is used. Facebook has positioned itself as a social space to facilitate socialization with others of your choosing. Then from that aspect it has tried to move in to the life quality enhancements. In people's minds the information they share on this platform is intended better the aspect of socialization with those they want to socialize with. Google has been a facilitator of life enhancements like an assistant. Starting at its beginning of just search, you share what you're looking for and it will help you find it. While it may not be obvious in people's minds it still registers at some level when you search you're yelling out to the world, "does anyone have any 6's". Google has tried to move in to the social space but that's not how they are viewed at their core. Everything Google does is ease of life assistance. I think a fair analogy in public perception is this. Telling things to Facebook is like telling your friends things. You don't expect them to share that information. Telling things to Google is like requesting something of your personal assistant, you expect them to be discreet but ultimately they will need to share things about you and your request in order to fulfill it.