I notice that the forum URL is marked as "Not secure" . I think I remember it as having a padlock. Not a problem really but I think Facebook rejects comments with unsecured links in them.
Steve

I think to be secure you have to subscribe to something. In this case your hosts subscription may have expired.

It means any communication with your host is not encrypted. Only a problem if you entering sensitive information. You get https in front of your url if coms is encrypted. Facebook thinks your a scally though

For chrome it's either https or "not secure". For other search engines it may be blank but all should show https for secured coms

I tried posting a link 4 times and after 5 minutes it vanished. maybe it's just me

Maybe it was secure when you posted. Could you try another link now (and wait 5 mins)

Another thing - maps on members profiles are not loading

Just sounds like the site's SSL certificate has expired which should be sorted out by the hosting company. Not sure who you use, but this would normally be an extra provided as part of the service along with the domain name. These usually last 12 months so need to be renewed each year. Assuming the subs have been paid it should be down to the hosting company to renew it (also assuming that you have all this taken care of as a package).