I have no idea what to do with LinkedIn. I have an account there. I think I posted that I work here. Otherwise, I really don't get it, but for what its worth, The Week looks at the significant number of people on LinkedIn, some of whom must be getting something out of it:
Number of LinkedIn users
The height, in feet, of a hypothetical stack of business cards representing all 100 million LinkedIn members
Number of LinkedIn users in the U.S.
Number of countries with LinkedIn users
Growth over the last year in LinkedIn users from Brazil
Growth over the last year in LinkedIn users from Mexico
Number of users joining LinkedIn every week
Share of LinkedIn users who are in the service industry
Share of LinkedIn users in the high-tech sector. Members in the finance sector represent the same share.
Number of Fortune 500 companies with executives on LinkedIn
Number of teachers with LinkedIn accounts
Number of chocolatiers with LinkedIn accounts
Number of Elvis tribute artists with LinkedIn accounts
Number of LinkedIn users who list "beatboxer" as their profession
Number of LinkedIn users who list "dog or cat psychologist" as their profession
Number of LinkedIn users who list "martini whisperer" as their profession
Amount of time LinkedIn has been in operation. The company launched in May 2003.
LinkedIn's total revenue in 2010. It makes money from recruitment and marketing services and premium subscriptions.
LinkedIn's net income in 2010
Estimated value of LinkedIn, as submitted in its January 2011 filing with the SEC