One mechanism that is commonly used is the obvious one — answers to other questions. Sometimes somebody will ask a question that strikes to the heart of an issue and draws large numbers of high-quality answers (and comments). Other times a seasoned veteran of the site will ask a generic question simply for the purpose of having a place to hang answers on. These are commonly tagged community-faq (or community-faq-proposed) in Super User. (Similar questions on Unix & Linux are called “canonical questions”. High-profile examples include:
- How do I add VBA in MS Office?
- How can I remove malicious spyware, malware, viruses or rootkits from my PC?
- What can I do if I forgot my Windows 7 password?
- How do I recover or “undelete” files that I accidentally deleted?
- What are PATH and other environment variables, and how can I set or use them?
- What are the shell's control and redirection operators? (on Unix & Linux)
- How to debug a bash script? (on Unix & Linux)
How do I recommend software in my answers? (tagged faq on Meta Super User) is, similarly, referenced in many comments.
If you’re feeling ambitious, write a broad question along the lines of the above and immediately post a similarly all-encompassing answer.