[smosher]

Last.fm was excluded due to "licensing issues."

I don't mean that literally, I mean that in the same sense last.fm uses it when presenting it as an excuse for the downward spiral they pretend is a service. Whether they're inflexible with regards to any kind of deal with Twitter or, or Twitter was uninterested in including them, it's their own fault—and direct a product of whatever "licensing issues" really means.