Facebook: Proprietary network without federation
Google Plus: Proprietary network without federation
So great, I can now jump from one locked-in network into another locked-in network.
Personally I think that Google Plus was the worst thing that can happen to networking in general, as it pretty much killed the chance of an open XMPP-based alternative.
All that said, I also used Facebook's export facility several weeks ago. It worked fine, but then I realized that I didn't care about backing up my Facebook data and deleted it :-)
Earlier this morning I sent a review of Google+ to my customers as a FYI. I made the same point that Scoble did: techies will like the fine grained control, most people will not care.
In general, I'm bullish on G+. A reviewer linked here made the best viral case for it I've seen so far: He hadn't made a profile or put any information out there on G+ but his friends with Gmail accounts added him to their various circle's and he, even having not yet chosen to participate in G+, got a big red notification stream in the top-right corner of every other Google service he uses.