The update seems to be key:<p><pre><code> Update: Google just posted this response to its official Google+ Page:
We are a bit surprised by Twitter’s comments about Search plus Your World,
because they chose not to renew their agreement with us last summer
(http://goo.gl/chKwi), and since then we have observed their rel=nofollow
instructions.
</code></pre>
If that's the case, it's hard to see what Twitter's complaining about. They're telling Google not to index tweets. If they want in on the game, then play ball.