When End Users get Lost

Wikis are collections of web pages which can be easily edited by the public, or a large group of contributors. They make it very easy to add content and links by using a web browser. However...

The creation of links is entirely manual. This leaves the poor user Working Out WhichThingsToLink - but what if those pages don't exist yet? What if they do, but with slightly different names?

What happens when someone creates a page about something you referred to in passing?

Can we do anything to help?