Q:

what's wrong with fb like button?

here is my situation:

i dont know why it return automatically, this error just happened with few details page, others are good`
<iframe src="http://www.facebook.com/plugins/like.php?app_id=209985355712105&amp;href=http%3A%2F%2Fwww.example.com{0}&amp;send=false&amp;layout=button_count&amp;width=90&amp;show_faces=true&amp;action=like&amp;colorscheme=light&amp;font=arial&amp;height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:90px; height:21px;" allowTransparency="true"></iframe>

value {0} can be change depend on page url detail. for example when user clicked view detail and then the url will be: example.com/viewdetail/item1.
then the value {0} will be change to: /viewdetail/item1

A:

This also happens, when you're trying to like localhost or anything else that is unreachable for Facebook (HTTP 404 or 403).
You should check if the given href is existent from the outer web and for the Facebook agent.  
Also check if the Linter (http://developers.facebook.com/tools/lint/) can reach your webpage.

