Huh? We're talking about Facebook refusing to keep reposting stuff from another site. That seems like exactly the opposite of the stuff Facebook might have some responsibility for, if it did have responsibility for stuff.
I mean, obviously, it's ambiguous whether Facebook is a repository, a gate-keeper, a community, a blogging-site or what. But the situation of stuff being reposted from other sites seems to be the least repository like. Deleting years of stuff that might not exist in other places would certainly be much more draconian.