I tried viewing the Facebook page for my local goban meetup recently to check on a schedule, and FB put a giant floating translucent white box over the bottom half of my screen with a single "login" button in the middle of it. So I could see there was content below but it was incredibly hard to read. There was not even an "X" button to close it. What it was saying was "join our website or get the hell out".
I understand enforcing login for write operations, since it's obviously required, but they really do seem to have no regard for the original ideals of the internet. They're not alone; Quora and others have done similarly stupid shit.
These companies are all supposedly started by hackers who love the internet and technology, but it's sad to see capitalism take hold in such an ugly way.