Dr. Dartnell has generously provided an online resource which is available to anyone to create a repository of knowledge they want to (a) keep and (b) share.
The forum was originally created to provide a place for readers of "The Knowledge" to discuss the book. However, demand for that capability has been on the modest side.
The alternative, for each person who is motivated to build up an online collection of tidbits of knowledge, remains very much available.
The model I am trying to illustrate is based upon a single idea ... The last week's posts are available for viewing with the "View active topics" button at top left on the main page.
If your "brand" is not listed there, it is time to compose another message, on a topic that interests you, that you want to be able to remember, and which you are willing to share.
While this forum is presently not showing up in Search Engine results, it IS open to all, so your postings will eventually arrive on the viewing screens of a couple of people.
My recommendation is that if members want to provide feedback to posters, they do so using the private email subsystem. That way, the poster can build up a series of messages which are not cluttered with messages by someone else.
Wikipedia has been proposed as a site for postings, and while I like that idea, I would like to point out that your "brand" is NOT on display there. Furthermore, your postings can be and WILL be edited by others, and they can even be removed by others.
Dr. Dartnell's forum is designed to protect your posts, and (at present) only Dr. Dartnell (or YOU) can delete them.
If you have a "Great (local region) Novel/Tome" knocking around in the back of your mind, here is a place to store footnotes.