I don't really see the point of last fm now that there is Spotify. And as regards the social interactivity Spotify is fully equipped because of its links to Facebook and Itunes. So why bother embrace Spotify in the library - and use Facebook and Twitter for interaction purposes. It's as simple as that...
There is no point for libraries to use other social networks for music just as there is no reason not to use Facebook and twitter and.. Google.
And now a commercial break:
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