It's quite telling that FB would block links that talk about FB in a negative way. The one true test of the long term viability of any medium is whether or not that medium is managed hands-off to the point that discussing the medium itself critically does not lead to the discussion being squelched. FB it appears does not pass that test.

It would be interesting to see what other links that discuss FB can not be shared there and even more interesting at what level of FB the directive initiating this blockage originated.