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The new Facebook ad on Facebook Stack Overflow appears on every single page load. A quick inspection with Firebug shows that jQuery is not included where the cookie check is being done:

$ is not defined    

if ($.cookie('fb_no_thx') || StackExchange.options.user.isRegistered) { (line 207)

Here's a screenshot:

Firebug screenshot

Also, this is the advertisement I'm talking about: Facebook advertisement

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up vote 7 down vote accepted

The JavaScript error has now been fixed - crisis averted... This was related to our favorite issue - caching.

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