Hard to make sense of this: What's a "widow clip" for example.
Everyone should be aware these days that everything you post on your FB page is open to the public. It is like printing it and pasting it on a notice board outside the pub for all to see - more than that, it never goes away.
If you post pictures of yourself as a teenager, with no trousers on, puking in the gutter, you can expect those pictures to come back and haunt you in later life - maybe when you apply for a job.
The seem to have discovered something from your public FB page and decided that they don't want you as a customer anymore. Of course you will have to disclose to any future insurer that you have been refused insurance by them.
Oh! In my opinion you have a snowball-in-hell's chance of suing them or claiming compensation for anything.