Only built-in action types [1] are allowed, if you keep reading. This includes: "Listen - Song".

Specifically:

The following Built-in Action-Object pairs are available:

Like - Any Object Type Follow - Profile Listen - Song Read - Article Watch - Video, Movie, TV Show, or TV Episode

IMO a great change for user experience.

1 - https://developers.facebook.com/docs/opengraph/actions/built...

That seems to be specifically allowed. Apps that help people automatically share stories about content as they consume it, such as the music you are listening to, can be good experiences when apps create clear expectations for the user of what is being shared and when.

That's an interesting one, I'd guess Spotify would be whitelisted if not as they started using the open graph before the public launch.

Most apps hook you in to click from seeing a post on someone else's timeline and auto posts what you're looking at to yours like a virus. Spotify posts because you've decided to share what you're listening to and it's disable-able. It's slightly less passive.

Social Cam sold at a good time, Viddy on the other hand are going to have to try and convince investors they're worth their $400m valuation.

Those are 'custom opengraph' stories and not wallposting on a user's behalf -- this announcement is unrelated.

Likely not if they're able to make profit from it...