The Scala tag wiki on Stack Overflow is rather, well, interesting in this regard - have a look at it. Someone actually wove together almost an entire language tutorial from one question successively to another, then another. That's great for a whole language tag, but it doesn't really allow for the smaller segments of 'chains' that you're talking about.
This is by design:
How does a post become a Community Wiki post?
There are several ways a question or answer can enter community wiki mode, and most of >these ways will occur automatically based on the rules of the system.
Posts enter community wiki mode when one of the following happens:
The body of the post has been edited† by at least five (5) >...
First and foremost, Stack Exchange is not a forum. There's a really good blog post on this that I can't find right now. The tl;dr version is that forums have a terrible signal to noise ratio.
Stack Exchange exists to build a library of high-quality questions and answers. Oddly enough, solving any one user's problem isn't as high a priority as one might ...
I've updated the following tag pages to include links to the Amazon pages for the books mentioned in the question:
The original poster has the same standing to edit as everyone else having sufficient rep to edit. In fact, suggested edits have pretty much invalidated the notion of community-owned posts (since anyone can suggest an edit).
StackExchange uses voting system to make good answers go all way up and bad ones all way down, not to give rewards and reputations to people. (And a reputation system is perhaps a way to rate users as well as give them permissions based on their reps)
Upvoting/Downvoting means this vote is useful/not useful