Re: Would have been helpful...
Seem to be trying to leverage fairly out of fashion concepts like RDF.
Fair enough but unless it has a way to encrypt and split your data across multiple locations with only you able to decrypt or provide tokens for certain elements plus some revenue model via ad or micropay mechanism i don't see this as being that radical.
I've argued with relatives about avoiding Facebook due to its narrowing of the web and data slurping and its only recently they have any inkling of what i was warning about.
Facebook is massive due to ignorance and laziness and until evolution removes both there will always be a Facebook of some kind or other for the masses, long long after i'm gone.