Well it seems that Ubuntu One is moving its first step into the social web; you can easily obtain a link for the song you're listening to. At variance with Apple's Ping, in Ubuntu One you can propagate this link to the (social) web, via all the services you've already set up in your microblogging client Gwibber. Far better than to have all inside iTunes only!
Oh, and as a nice surplus, you find your messages on Ubuntu One front page too. As an example, you can find on that web page a few of my recent played songs (user @mcastel)š
