Google Buzz 2.0?…
But Google has a secret weapon when it comes to mapping social connections: Gmail. The search company's email service has hundreds of millions of users. And those who use the site regularly may have accumulated hundreds of contacts. When a user clicks +1, Google can show that not just to the user's friends in Google+ but also to certain contacts in Gmail, including those on a user's chat list. On Facebook, it's understood that "likes" are shared with friends. But Google users that click +1 may not be aware that Google is using it to target ads at some of their Gmail connections, which could prove a privacy concern.
HEARD ON THE STREET: Google +1 Looks to Crash Facebook Gathering - WSJ.com
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