Ahh, you found the conflict. Thanks.
It wasn't quite what you thought but I know where the conflict is now. The links at the top of the page are just hyperlinks to social pages with no java, so the issue wasn't there.
Lightbulb goes off... the "Facebook" connect button is not showing on ANY page that has "AddThis" social sharing code. Which for me is all custom pages, CMS articles, threads, etc - a ton of pages
Seems that anyone using AddThis on vBulletin should be seeing this issue.
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Edit: Found some info on AddThis for asynchronous loading. Seems to have solved the conflict. Thanks again.
http://support.addthis.com/customer/...is-performance