And if you look at the comment wherein I used that single line, I then went on to add this:

    Certainly I'd be incorporating an exit strategy,
    and my game plan would be to leverage off FB to
    start with, to grow as fast as possible, develop
    my own community and eco-system, and then be able
    to shed FB and replace it with something else.

Is that not enough of an expansion of the thought, pointing out that using FB (or whoever) is valid to start with provided you have some sort of exit strategy?