LinkedIn, the professional social network created by Reid Hoffman has turned 7 years old according to Senior Director of Corporate Communications Kay Luo. LinkedIn was founded in December 2002, but actually launched on May 5, 2003. LinkedIn has about 65 million registered users and it could be worth over $1 billion according to several estimates.
I have been highly critical about LinkedIn in the past because I felt like Facebook was more useful. It has been about 4 years since I graduated college and now I am starting to really see how useful LinkedIn is. Kudos to Hoffman and his team for putting together a service that encourages professional network building. [Mashable]