But LinkedIn makes much of its money by charging an elite group of corporate recruiters big money for the right to sift through member profiles, hunting for great candidates to hire.

FORBES: Why You Suddenly Can't Resist Updating Your LinkedIn Profile

Consider taking corporate intranets mobile and adding elements of twitter, linkedin, news feeds, create employee profiles where they are able to publish their personal research and expertise blog for the internal customers of their department and where departments can freely review these areas to increase thought leadership among the managers and senior staff.

FORBES: Completing the Social Business Transformation: A Manifesto

And in the center is LinkedIn's richest and fastest-growing opportunity: turning the company's 161 million member profiles into the 21st-century version of a "little black book" that no corporate recruiter can live without.

FORBES: Feature

Key corporate news these days can be gleaned from publicly available information such as updates to executives' LinkedIn profiles describing new roles and company job postings looking for new skills or for staff in new parts of the world.

WSJ: Gordon Crovitz: The SEC Decriminalizes Facebook Postings