You can think of the Agora as a sort of distributed wiki, although users in this particular kind of wiki volunteer individual contributions instead of editing common pages (for now).
Wikilinks are great because they allow for very easy linking: you just [[link it as you go along]], then the link either works (because someone wrote that node/article/resource already) or you can click through and backfill it. I call this procedure link-driven writing.
Whenever there is more than one [[node]] with a given wikilink in an Agora (typical use case: notes kept on a certain topic by different users), the Agora will surface all of them when resolving the wikilink in question. Example: [[README]].