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Looks interesting, nice to see last.fm support out of the box. Could anyone quickly clarify what the difference between "adding" a song and "liking" it is?

EDIT: if you start playing a new song in a new tab it doesn't stop the old one.

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Adding a song allows you to add it to one of your playlist, or at least on top of your profile. Liking a song just makes it show up on the "likes" tab of your profile. In both cases, the person who posted the track is notified, and their counters increment. On the rankings (whyd.com/hot), only "adds" are counted.

I think Last.fm support is pretty much a requirement for a music start-up - assuming the start-up wants to attract early adopters who are music enthusiasts.

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