That is a bit odd. They may have implemented more aggressive blocking to prevent content scraping. I doubt they intend to block social cards as they exist here.
Most servers aren't this aggressive and work fine.
I'm pretty sure that's a similar reason to why cbc.ca news articles never work here. Our freakin country and that C-18 bill, i'd quite expect cbc to be blocking their content. Every single time, "the operation was aborted"