The wiki world is blurry. What is the difference between a wiki and a content management system or a blog? WhatIsaWiki?
Pages can be edited in all systems.
Many systems have multiple users, and some single user systems call themselves a wiki.
All modern text writing systems support hypertext. Some make it easier than others, but there is no sharp delineation.
TimurIsmagilov: is having hypertext what defines a modern system or is it just what modern systems have in common?
If something is “like a wiki” some feature of the system stands out as not having the WikiNature. What is it?