For a host of reasons there's a shortage of these so-called rock-star bosses who can bring a company instant credibility.

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Biden "brings instant credibility on foreign policy and the current inner-workings of Washington, " said Ryan Howell of Midland, Michigan.

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It gives us instant credibility, high visibility in the search engines, and significant traffic, even apart from the value of the services we have built on top of it.

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Those names give the company instant credibility.

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The Vikings no doubt will look to add more in the draft coming up next month as well, but having Jennings in the fold gives the group instant credibility and an accomplished veteran that can serve as a mentor to the younger players in the group.

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But Twitter would give the Redmond giant instant grasp of a flourishing Web communication destination, and credibility in tech circles.

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