Thread Wiki or Member Summary

How can I set up a thread wiki. This is sometimes known as a member summary. Some examples:
http://www.fatwallet.com/forums/finance/783099/
http://www.flyertalk.com/forum/credit-card-programs/1177334-special-credit-card-offers-master-thread-subscription.html
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Comments
So basically you want to mark threads as some kind of community wiki?
This is actually a great use for the Discussion Inserts plugin:
http://vanillaforums.org/addon/discussioninserts-plugin
You can pin these threads and then use the plugin to add a message like "This is a wiki thread".
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Great idea. Playing around with it now. Not seeing an obvious way to change group permissions to allow general members to edit just the insert. Paging @phreak
Just an FYI here is how I solved this. I just created a new sub-category and allowed everyone to edit the discussion in the permissions. I didn't realize this was an option until today.