Simon Cowell (@simoncowell) has officially (and finally) joined Twitter, and has taken to the network with some gusto, using his new profile to taunt fellow The X Factor USA judges L.A. Reid, Paula Abdul and Nicole Scherzinger.

But it’s his barbed exchanges with former Britain’s Got Talent co-judge Piers Morgan that have brought the most attention, with the two ribbing each other’s respective popularity, and now bookmakers have made Cowell the overwhelming favorite to trump Morgan in Twitter followers by the end of 2011.

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