Yeah, google know your home and where your workplace is but doesn't publish it to everyone. Facebook did that with a lot of information. Plus it may change how things behave without you agreement (think of @facebook.com emails)

Google also use that data to provide a service (automatically call the navigation app to came back home at night or just give you a reminder on places you go every week). I doon't think facebook will give any kind of service other than keep my friens updated about whatever I do and wherever I go and this is frightening (not the fact that a big company has this data but the fact that everyone will know it)