PostRank, an Ontario, Canada-based company that measures and monitors social Web data, has taken a closer look at how much content from large PR firms was shared across Delicious, Twitter, Facebook, comments, and trackbacks during the month of February.

Overall, Edelman comes out on top with 1,766 total actions taken by people online. The firm also topped the Twitter column with 1,490 sharing instances.

Update after the jump.

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