The professional social network LinkedIn is winning the business-to-business battle, Joel Capperella writes in this first article of a series. "Slowly and steadily, LinkedIn has methodically evolved into a social media powerhouse making it almost impossible for competitors to enter its sphere," he writes. The network's segmentation is powerful, its news curating useful, and company recommendations and a new endorsements feature separate it from the pack. Endorsements are "far more valuable than the enigmatic influence ratings currently available on the social web like Klout, or Twyla," Capperella writes.

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