Amanda Blum writes: “The news [that Automattic, which owns WordPress.com and Tumblr, is selling data to AI modeling companies] brought up a common confusion that emerges whenever discussion turns to WordPress matters, and one that’s important if you are concerned whether this data brokerage will affect you: What is the difference between WordPress, the content management system, and WordPress.com, the web hosting site—and is your personal WordPress site included in the data being sold?”