The most important stuff first: As for Buzz’s implications for journalism, the two best quick guides are by 
The Newsonomics of social media optimization
[Each week, our friend Ken Doctor — author of Newsonomics and longtime watcher of the business side of digital news — writes about the economics of the news business for the Lab.]
This week’s buzz is all about Google Buzz, the search giant’s entry into the status-update world. But the humming of social media — and its implications for news media — just keeps getting louder and louder. News people are in the social web, use the social web and write about the social web — but can they can make the social web part of their digital publishing businesses? That’s a big, important question, and one just dawning on many people in the news business.
First, let’s consider a number of datapoints:
— Nielsen reports that Internet users worldwide now spend 5.35 hours a month on social networks, up from just three hours a year ago. The social web is the new home page; remember how news sites all put up “make us your home page” buttons just a decade ago. News sites, of course, are lucky to break into double digits — 10 minutes — per month in usage.
— Facebook Mobile just announced yesterday that it busted through the 100 million user mark, up from 65 million in September.
— Bit.ly, one of the top “URL shortening service providers” — sends about two billion link referrals a month, largely given its Twitter stronghold. Question, of course, is how many of those may link to news or information; try, maybe, 20 percent, according to a recent Rutgers survey of social use that shows that 20 percent of posts in the statusphere come from “informers,” those that share news and information. The other 80 percent: the what-I-ate-today people.
— A recent study I did with Outsell said that 44 percent of news readers say they use social networks to share news and information. Of those, half use Facebook to do it; one in five use Twitter.
— Also late last week, several media folks got some extended time with Google execs at Davos. Guardian editor Alan Rusbridger posted his 
