New LinkedIn URLs not displaying as content cards

[ideag]

I have successfully added content cared from many different sources to my site http://www.galiadigital.co.uk. However, the last couple of LinkedIn posts I have tried to add have simply displayed as a link with the text as just http://www.linkedin.com and the link itself going to the correct URL. Old cards are not affected.
I have tried making a new card with an older URL from May and the card works. Anything prior works. Anything from July onwards does not, which makes me think this is LinkedIn change.

https://wordpress.org/support/topic/new-linkedin-urls-not-displaying-as-content-cards/

[ideag]

Tried out a couple of LinkedIn Pulse links and they worked on my test site without any glitch. Hmm.

[ideag]

Still can't reproduce this one and the OP has not come back to us with more details. Closing this one as invalid

[ideag]

Apparently, Linkedin starts blocking after repeated requests from same ip: http://stackoverflow.com/questions/27231113/999-error-code-on-head-request-to-linkedin