who made wikistr.com ? 

 oh fiatjaf of course https://github.com/fiatjaf/wikistr 

 We're spinning up an instance of Wikistr. 😊 

 Alexandria is also a kind of wiki, yes, but a different type, with a complex data structure.

Knowledge Base. 

 We have networks of users, network of relay connections, now we're going to have a network* of ideas.

*
https://en.m.wikipedia.org/wiki/Rhizome_(philosophy)