Quick Summary ("wiki") feature?
 

Explanation
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It's a "wiki" (if I'm using the term correctly) which is auto-posted by the system which allows all users to edit that post. It can be a very handy function.

Example
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1) Go here: http://www.fatwallet.com/forums/hot-deals/962136/
2) Look at the second post

Question
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Does this exist in the latest version (3.8?) or will it be in the upcoming 4.0? Is it built-in or an available add-on/plug-in?