Tags or labels on articles (when you do a new post it's called "Labels for this post" at the bottom of the page) can help organise the posts into useful categories.
Each post might have some of the following types of tags
General description: author, title of book etc.
Subject: e.g. politics, economics, news
To read:
Tags that indicate that someone should read this article/book etc.
e.g. "to read - alex" - if you want Alex to read it, or "to read - all" if you want everyone to read it
