It is a constant buzz and a constant noise you have to deal with.
VOA: standard.2010.06.14
The buzz you're hearing is the mainstream media and political establishment reacting in anger that McCain's gone outside the circle in choosing a running mate.
The idea is that in one social networking news feed, say in Google Buzz, you would see not only the activity from your social network in Google Buzz but also the activity from your social network in Facebook or Chatter.com or LinkedIn.