LinkedIn may not be in the same league as Facebook and Twitter, but it's catching up. The professional-networking site recently passed the milestone of 100 million users and is growing exponentially. According to the site's creators, a million people are signing up to LinkedIn every week. The site connects members in the same industry, allowing them to network with each other online, and hosts company pages listing employees from firms such as Apple, Cisco, eBay, and Amazon. Here, a look at the numbers behind LinkedIn's growth:
100 million
Number of LinkedIn users
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98,425
The height, in feet, of a hypothetical stack of business cards representing all 100 million LinkedIn members
44 million
Number of LinkedIn users in the U.S.
200
Number of countries with LinkedIn users
428 percent
Growth over the last year in LinkedIn users from Brazil
178 percent
Growth over the last year in LinkedIn users from Mexico
1 million
Number of users joining LinkedIn every week
20 percent
Share of LinkedIn users who are in the service industry
9 percent
Share of LinkedIn users in the high-tech sector. Members in the finance sector represent the same share.
500
Number of Fortune 500 companies with executives on LinkedIn
997,000
Number of teachers with LinkedIn accounts
1,030
Number of chocolatiers with LinkedIn accounts
74
Number of Elvis tribute artists with LinkedIn accounts
46
Number of LinkedIn users who list "beatboxer" as their profession
4
Number of LinkedIn users who list "dog or cat psychologist" as their profession
1
Number of LinkedIn users who list "martini whisperer" as their profession
8 years
Amount of time LinkedIn has been in operation. The company launched in May 2003.
$243 million
LinkedIn's total revenue in 2010. It makes money from recruitment and marketing services and premium subscriptions.
$15.4 million
LinkedIn's net income in 2010
$175 million
Estimated value of LinkedIn, as submitted in its January 2011 filing with the SEC
600 million
Number of Facebook users
$2 billion
Facebook's approximate total revenue in 2010
$500 million
Facebook's approximate net income in 2010
200 million
Number of Twitter users who have joined since its launch in 2007
3.2 million
Number of users joining Twitter every week (460,000 every day)
Sources: LinkedIn (2), CNET, TechCrunch, Reuters
