Facebook is private information. I wouldn't advise you make this public.
Upload your collection on Numista as this is a more trustworthy method of dealing with other Numista members.
I wanted to show actual pictures of my coins. So members know what they are receiving from me. They can see the true condition of the coins. If you say it is against the Numista forum rules, I wouldn't show my Fb link in future.
Thank you
The easiest way to display a link to a photo of your coin is by using lightshot. Just print screen the photo of the coin on facebook and post the lightshot link.
To download the app click here => http://app.prntscr.com/
Takes just a few minutes to download it.