Oprah

When Oprah Winfrey endorses a company's product, the marketing team whoops and the supply chain team grimaces. History shows that if you're going to get the "Oprah Effect," you better be ready to deliver the goods.

Oprah's Twitter debut may have left some techies less than elated -- the much-hyped news, after all, brought with it the prospect of countless soccer moms signing up and overloading an already flimsy network. In the end, though, it looks like Twitter may have been ready for the rush.