"Sticky posts" are used in forums where the jumping off point is a list of the posts (like PM's nodes). The posts marked as sticky are usually always at the top of that list regardless of the ordering, presumably so they're more likely to be seen. Take a look at the Firebird forum on MozillaZine.

In reply to Re: Re: "Sticky" nodes by The Mad Hatter
in thread "Sticky" nodes by DaWolf

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