Studying wikis to choose one for http://www.successjourneyclub.com that can handle having public pages, and private pages for only logged in users.
List of wikis to study:
Easy to install
dokuwiki v20140929 - DokuWiki is a standards compliant, simple to use Wiki.
mediawiki v1.31.0 - Open source knowledgebase and content management system
phpWiki v1.4.0rc1 - A WikiWikiWeb is a site where everyone can collaborate on the content.
PukiWiki v1.4.7 - PHP scripts for Web pages which can be edited by anyone, at any time, from anywhere.