The prolific Brian Solis writes about social media being both a boon and a distraction on his blog at:
http://www.briansolis.com/2010/03/twitter-and-facebook-the-new-tools-of-...

Here's the post:

Twitter and Facebook: The New Tools of Productivity or Distraction
March 26, 2010

The argument is strong on either side of the case: do social networks increase or decrease productivity on the job?

Facebook's Mark Zuckerberg on the end of privacy as reported in Read Write Web at:
http://www.readwriteweb.com/archives/facebooks_zuckerberg_says_the_age_o...

Here's the post:

Facebook's Zuckerberg Says The Age of Privacy is Over
Written by Marshall Kirkpatrick / January 9, 2010

Facebook founder Mark Zuckerberg told a live audience yesterday that if he were to create Facebook again today, user information would by default be public, not private as it was for years until the company changed dramatically in December.

Ben Parr has an excellent year end post on Mashable at:
http://mashable.com/2009/12/30/facebook-2009/

Here's the post:

How Facebook Dominated in 2009

December 30th, 2009 | by Ben Parr

To most observers, 2009 marked the year Twitter conquered the world. Yet it wasn’t the only social media company that grew like wildfire. There’s another that grew even more rapidly, adding over 200 million new users and raising $200 million dollars — double that of Twitter’s most recent round.

Traci Armstrong has a good postin Ad Age on why companies shoud give emploees "Facebook time" at:
http://adage.com/talentworks/article?article_id=140556

Here's the post:

Give Employees Facebook Time
Six Ways Social-Media Freedom Benefits Employers
by Traci Armstrong
Published: November 16, 2009

Madalyn Sklar has a very helpful post on using Facebook contests on her blog at:
http://www.madalynsblog.com/coach/blog/2009/08/how-i-got-bunch-of-new-fa...

Here's the post:

How I Got A Bunch Of New Facebook Fans

by Madalyn Sklar

Bill Johnston shares research about Social Media ecosystems on the Online Community Report at:
http://www.onlinecommunityreport.com/archives/537-Social-Media-Ecosystem...

Here's the post:

TechCrunch's Michael Arrigton has an interesting post on the Seeking Alpha blog about the valuations of the major social networks in light of the Russian investment in Facebook at:
http://seekingalpha.com/article/141468-social-networks-modeling-valuatio...

Here's the post:

Social Networks: Modeling Valuations in 2009
by: Michael Arrington
June 05, 2009

Jonathan Yarmis has an opinion piece in Business Week on how Facebook will change advertising at:
http://www.businessweek.com/technology/content/may2009/tc20090527_635562...

Here's the post:

How Facebook Will Upend Advertising
With social networks like Facebook transforming the way companies communicate with consumers, it's time for the ad industry to get its head out of the sand
By Jonathan L. Yarmis

As usual, its the affiliate marketers who have figured out an ad medium before the rest of us. In this case its Facebook ads. Harrison Gevirtz has a smart post on the ZacJohnson.com blog at:
http://zacjohnson.com/facebook-ads-versus-google-adwords/

Here's the post:

Facebook Ads versus Google AdWords
By Harrsion Gevirtz

Great post of 20 Facebook tips and tricks at:
http://www.hongkiat.com/blog/20-facebook-tipstricks-you-might-not-know/