TOPIC: Like on facebook - no credits

Good afternoon.
I'm with a problem I've ever comes happened for some time.
I asks me Link's on facebook for me to do LIKE, and when I do that and I update the page does not get the credits.
This problem only happens to me on facebook, because in twiter, google + and other works perfectly.
What can I do?
Thank U

It happens sometimes, should not happen always.

Regards,
Dejan