Apparently SAP, Goldman Sachs, Bessemer Venture Partners, and McGraw Hill believe that relationships DO matter.  Or at least back in June they did.  The four companies invested $22.7 million on top of the $53 million LinkedIn received this past June.  The total $75.7 million Series D investment is based on a $1 billion valuation.   

To date, LinkedIn has raised over $100 million for their professional social network service.  LinkedIn has about 370 employees and their revenues are growing 100% per year.  LinkedIn CEO Dan Nye informed TechCrunch that the company has been profitable since 2006.  

LinkedIn has about 30 million registered users.  LinkedIn receives over 4 million uniques per month.  The previous investors of the $53 million were Bain Capital Ventures, Sequoia Capital, Greylock Partners and Bessemer Venture Partners.