Always the Last to Know: "Who To Follow"

I NEVER log in to the main Twitter site, which is why I didn't know about this.  When I present on social media, one of the constant questions I get is, in fact, "who should I follow on Twitter?"  I always tell people to start with following people they know who they know to be interesting and people whose blogs they read, then start looking at who *those* people follow, etc.  Well, now Twitter's helping people to answer that question by looking at users' existing connections and making suggestions based on them.  How useful!