Have you tried removing the link from the description in picture page & see it lets you post it then? I've heard of Facebook blocking links to pages containing links or banned keywords. They did it to a Guardian article (about Wikileaks or piracy I think it was) a few weeks ago.
I'm getting the exact same error message trying to post various links from Wikipedia. Just started before, as even a link I posted 2 hours ago is not working.
Something is obviously wrong with their content filters tonight.
@humphreyhippoI have the same issue, it appears to have started sometime last night. All of my posts from June are suddenly gone from my FB page. I usually remove the URL from the description. @scrivna
@kmrtn6 --- Yes, my son was telling me the same thing. I only posted two this morning so that could not have been the issue. It appears to have been a facebook thing because my previously posted links reappeared after a couple of hours. ;-)
Something is obviously wrong with their content filters tonight.
I'm not a FB user, but I hope it gets fixed for everyone soon. :)