Facebook – Could not retrieve data from URL on Facebook

It looks like you have some sort of rule in your server configuration file that is serving empty content to the Facebook crawler. Check your .htaccess file and server logs to see what is going on here.

Once you fix this, you'll most likely still have issues. The Facebook parser is pretty strict and you have some major problems with your XHTML.

The error message explains it clearly. It looks like you're trying to post links to sites that Facebook deems "unsafe", likely because it is overtly or secretly set up to use exploits to compromise the system of whoever visits. (Google does much the same thing in their search results and with the Chrome browser.)

Facebook tries to be helpful by converting text that looks like a web domain into a link, because most people aren't savvy enough to do it themselves. But those particular strings happen to be for bad actors. Unless you're trying to tell people not to go to those sites, I can't think of a single reason you need to be able to post them.