Hi,
Site is http://rossanavanoni.com
I've deactivated and reactivated jetpack. Deactivated Wordpress SEO (Youst). Done tests with manual publish and scheduled publish. Same problem. Publicize does not send to Facebook, Google+, Twitter, Linkedin, Path or Tumblr.
I'm hosted with Godaddy Managed Wordpress. I know that a few months ago Jetpack had an issue on their side with Godaddy. I don't know if it's the same issue. I've been reading that some Godaddy clients are having this publicize problem again.