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I started to write this as a comment in response to @Canina's answer, but realized it's a different proposal on it's own. Bit of brainstorming:

A FAQ is not necessarily some help page with everything written down. It could as well be integrated site support. Such a FAQ system would have:

- A way for nominating questions for FAQ status (flagging etc).
- A way of voting if such a nominated question should get/lose FAQ status. The voting would be automatically triggered whenever someone makes a nomination, resulting in a public poll.
- A way of presenting a collection of links with FAQ status. Preferably based on tags. So you could have an expandable view based on tags. 

Suppose for example there's a question on Software Development describing how to implement `toString` for a Java class properly. Someone nominates it, the community votes and it gets FAQ status. Using tags from the post such "java", "tostring", "strings", it might be possible to build an expandable view: Java -> Strings -> toString.

  Now if I have a question about string handling in Java, I could easily go check if there's a FAQ for it.

This would work in harmony with "canonical dupe", user-maintained FAQ and so on.