LinkedIn recently hit 100M users. If you were in charge at LinkedIn, what would be your strategic goals for the next several years? How would you achieve them?

Clearly LinkedIn needs to prepare for the inevitable razing of the garden walls.   Since the time of this case, Facebook (among other sites) has opened up a login api that permits other sites to receive authentication credentials from Facebook.  Once authenticated, the sites also have access to some profile and network information.  Sites then list Facebook information on their own pages.  This helps provide even more access to Facebook and drives more traffic to Facebook. 

LinkedIn can follow a similar model.  They may want to restrict access to this API to only those organizations that pass a certain "Professional in Nature" test but the additional exposure will clearly drive more traffic to their site and increase the value of their service. 

Another area of seeming opportunity is on the Job Postings front.  LinkedIn seems poised to take control of the job postings/job search market.  Their user base already represents most of the companies in the US and I have heard that most, if not all, recruiters now use linkedIn heavily during recruiting efforts.  LinkedIn could take a larger chunk of this market without major efforts in terms of feature development.  A heavy marketing campaign may be able to win over a large portion of that market.