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Troubleshotting Facebook code
Any Facebook code got in https://developers.facebook.com/docs/plugins/ such as:

• Like Button 
• Send Button
• Subscribe Button 
• Comments 
• Activity Feed
• Recommendations 
• Like Box 
• Login Button
• Registration 
• Facepile
• Live Stream 

That stops working, check these things:

• First go to the facebook debugger and input the problematic url, sometimes just doing it, fixes problems such as wrong meta data or wrong likes numbers.
• Is the required Javascript sdk in the header of your site? it doesnt work if you move it to the bottom
• Is the code copy pasted right, some template systems can mess your code, so make sure yours get the appropriate VERBATIM, :plain or whatever tag your templating system uses to pass textual content.
• Are your running the code on the same url the code is configured in.
• Is the code inside a div or an element with an id, this can be tricky to spot, but some Facebook code requires some css selecting that can be messed up if you put it inside an html element with an id.
• Any other common mistakes, please post them in the comments.