Facebook link undefined

Hello, i have a problem with the facebook stream.
if you check my website www.torino2015oncampus.it/
you'll see a link at the bottom of each post with the id of the profile, but the link is undefined

Hi,
Sorry for reply my delay!
I see that not all link image are error,
Currently, I can't fix this error, because this post link(title, image, descripsion..) is returned through API of Facebook.

Best regard,
Tinh