Sorry for the late response.
I think to make "actions" work, according to the document, this line:
-F 'actions={"name": "View on Zombo", "link": "http://www.zombo.com"} \
You'll need to pass an JSON for "actions", not a ruby array of hash.
So you might use JSON.dump or Yajl::Encoder.encode on the
actions argument according the JSON library you're using.
http://developers.facebook.com/docs/reference/api/post
cheers,