I agree in part. No Facebook is not a subset like AOL was. It is far worse in my opinion. Facebook desires to be that 'constant companion' to the point where it is synonymous with the Internet. They want you to be logged-in and accessing their servers 24/7 where ever you are on the net.
I am constantly finding sites where I can log in without creating a unique ID at that site. All I need to do is log in through my Facebook account, which I never intend to get. Will it time come when a Facebook account becomes an Internet ID of sorts? Microsoft tried it with OnePass, I believe it was called, and failed. Social networking is now sold to millions who simply accept it as 'the new normal'. Facebook might just succeed.
There are cross-postings to Facebook everywhere - eBay, Amazon, etc. Hell, even my bank has connections to Facebook. All, yes, millions just shrug it off saying there is no privacy today anyway. What do you have to hide? But there is still. It takes me a bit of effort (using different browsers, using blocking extensions, managing my cookies manually instead of automagically, proxy's, etc.) and I leave a very small footprint on the net.
Of course, I am looked at as if I am a criminal as they are the ones who normally use such measures to avoid detection and hide their tracks. 
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