I've got an annual to Pandora because I like their experiment at how to link up music.
I've got an 'alternative rock' feed. I just heard a cover of "Come On Eileen" by the band Save Ferris.
And the page told me that Stax Blackmoor likes that band. staxxy is an internet friend, of course, but I never told Pandora to look for that kind of interconnection.
I'm not sure if I find that annoyingly intrusive or annoyingly convenient. I'm sure part of the connect-the-dots code is facilitated by my using Google Chrome for a browser.