Five Bubble Book Club discussion

Just found the follow site, which shows how "close" authors are to each other in terms of common readership: https://www.literature-map.com/. It's been fun looking at who it recommends.

For example, https://www.literature-map.com/terry+.... I, for one, would not put George R.R. Martin that close to Terry Pratchett -- someone funnier seems more appropriate! But people who like one of those authors, like the other, so there you are.

If you want to add your own favorite authors, go here: https://www.gnooks.com/.

Where did they get their data? This sounds like targeting ads in practice.