Google News Tries Sharing With Facebook, But Where’s The Buzz Button?

Google News is testing out a new design, as I reported earlier this month . It includes trending topics on the left and new personalization options. But today someone in the bucket test noticed something different. The sharing options changed. Each story can be shared via email, Google Reader, or Facebook. Most people won't see this. It is just in a limited test. But it does suggest that Google is starting to seriously think about ways to drive more sharing of content across the Web. But why push content to Facebook and not to Twitter? And for that matter where is the Google Buzz button?