It seems most people here are against this because of Facebook's (or other service providers') gain from it, but no one is arguing against Mark's actual point: "some access is better than none at all", which I think is more important. Internet.org may not succeed at the end, because of the conflict of interests in many parties (corporate and political) involved in its running. But the idea of providing limited access…
Yup, like an hour a day instead of all day. Or 100 MB instead of 100 GB.
Not: Facebook instead of Google.