Been reading up on this after the last post as it all sounds pretty cool.
Facebook have just introduced an interface to create your own apps that run inside their site.
Seeing as they have 20,000,000 users or something I was just thinking....
A 'playing now' interface for facebook that at a minimum showed the currently playing song, or could maybe more impressively show some details from the users MC (10 most played songs, 10 last songs played, 10 newest songs added to their DB etc).
The way Facebook works is that if one user adds the MC app to their page then it instantly tells all his friends that they have added it so they can choose to add it too (and their friends in turn would be told if they also added it etc - ultimate pyramid scheme to broadcast MC's greatness).
Another new thing that I read is its possible to re-write the facebook photo page as an app - they also claimed facebook is the 6th most viewed site as well as saying it is the most used photo site there is.
If u guys wrote a new photo page for facebook that used its tagging abilities and integrated it with MC to give a better looking photo album on the users site that could be managed locally, you'd get HUGE exposure.
We all know web integration is coming closer and closer every day for software (just look at Oracle even - their admin console is now purely web based since v10) - MC likes to be on the cutting edge and pushing the boundaries - this would be taking it to the ultimate level
Probably a bit far fetched ideas but just thought I'd throw them out there. It could have HUGE implications of exposure but I am aware it would also require quite a bit of work.