And why exactly do you think Facebook is offering this service? (And, furthermore, why exactly do you think they are offering this service with access only to F

And why exactly do you think Facebook is offering this service? (And, furthermore, why exactly do you think they are offering this service with access only to Facebook and Facebook approved sites, rather than to the Internet at large)? [On edit: I seem to be getting a lot of downvotes on this post, yet no actual answers to the question]