Over the past two months, the difference in Buzz scores between the two groups has begun to diminish, returning to nearly where they were before the campaign.
In other words, users will be able to invite groups of friends from their e-mail accounts or Facebook profiles and link their buzz.com activity to those sites rather than replicating their social-networking networks on buzz.com.
As Kashmir wrote, the company could have used that technique to automatically segment users into Facebook Groups, but would likely have incurred the same privacy wrath that Google faced when its Google Buzz trick exposed who users were most often chatting with without their express consent.