I just happen to be reading the LinkedIn S1 filing[1] last night and was thinking the same thing while going through it - these guys have not been getting nearly enough credit for what they have created.<p>LinkedIn was generating revenue within a year of being founded, and its current numbers are just crazy: 1,100 employees, 102M members, 75M visitors, 7.1B pageviews last quarter, $93M in revenue last quarter and on track to do almost $400M in revenue this year. Look at the revenue growth: 2009: $120M, 2010: $243M. Over a billion invitations sent last year. 75% of the Fortune 100 using their professional services as part of recruiting, and they have already diversified to three separate and solid revenue streams.<p>They are not profitable but that is because they do not want to be - they have doubled investment in R&D, development and marketing in the past 12 months. They still have plenty of room to expand, especially internationally.<p>I am not surprised that their target listing price has increased a number of times since the filing - they are on target to reach about $1B in revenue in 2012/13 and a market cap of $3B seemed low, it might still see a sharp first-week increase with the new list price.<p>Excellent return for the investors, who have only had to invest $103M[2] to date (Greylock, Sequoia, BVP and Kopelman). Not sure why they went with the NYSE over the NASDAQ, but this IPO could be a nice investment if you are looking for a tech IPO.<p>LinkedIn haven't nearly received the amount of coverage they deserve, it is a web 2.0 sleeper hit that went about building its business with little controversy, no huge news splash, no secondary market price surge, and no personality conflicts (at least not in public).<p>Edit: And not to forget, LinkedIn has made some excellent contributions to open source software, especially with Voldermont, their distributed kv store (I have used it in dev but not in production, it is pretty cool). If you are using Apache Lucene and/or Hadoop, checkout the LinkedIn projects.<p>[1] <a href="http://www.sec.gov/Archives/edgar/data/1271024/000119312511131453/ds1a.htm" rel="nofollow">http://www.sec.gov/Archives/edgar/data/1271024/0001193125111...</a><p>[2] <a href="http://www.crunchbase.com/company/linkedin" rel="nofollow">http://www.crunchbase.com/company/linkedin</a><p>[3] <a href="http://linkedin.github.com/" rel="nofollow">http://linkedin.github.com/</a><p>[4] <a href="http://project-voldemort.com/" rel="nofollow">http://project-voldemort.com/</a>