Unable to share the website links on facebook

[Hyperspace2]

i was installing facebook comment plugin in my website.
But it says the url is unreachable . I have used noah classified website. whenever i have to share the item in it, the facebook turns into other kinds of link
For eg www.noahclassified.com/index.php?item/31 turns into www.noahclassified.com/index.php?item%2F31 .
So when i looked developers tool, it says the webpage have to include og:url, which i have done. Please help me to fix this problem because without this the site cannot be shared in facebook. Thank you for your time to read my problem, hope you will help me.

 

[Hyperspace2]

otherwise you can think of the problem how would you maintain facebook like or
comment plugin for this thread which i have made now

"https://www.physicsforums.com/showthread.php?t=647358"---->how to install facebook
like or comment plugin for each thread in physics forums