What is the simplest/easiest 'wiki' to set up?

[joe at actionline.com]

What is the simplest/easiest 'wiki' to set up?

Just did a google search for: simple wiki software and among the
millions of hits, these look potentially promising:

- http://en.wikipedia.org/wiki/Wiki
- http://c2.com/cgi/wiki?SimplestOrEasiest
- http://c2.com/cgi/wiki?EasiestInstallableWikiContest
- http://en.wikipedia.org/wiki/List_of_wiki_software
-
http://www.clickonf5.org/7599/10-free-opensource-wiki-software-engine/
-
http://stackoverflow.com/questions/7848899/really-simple-wiki-platform
- https://www.dokuwiki.org/dokuwiki

But before I begin to plow through these first hits, I hope the plug
brain trust might point me in the right direction.  I do have have
web hosted space where I can install something and I just want 4 or
5 people to be able to access a simple "page" where each participant
can quickly and easily add to the content with simple text.

Suggestions?

Thanks.