iPhone Celebrity Sightings... er... Twitter'ings: Ashton and Demi Edition

The continuing evolution of Twitter as a mainstream celebrity interactive communication platform powered by Apple's revolutionary internet device, the iPhone 3G, and awesome client side apps Twitterfon and Tweetie, or the end of all things geeky-fringe and techno-pure? Or just a cheap excuse for us to link-bait some celebrities (who are not Stephen Fry) using iPhone's and tweeting on Superbowl Sunday?
Yes!
Does it matter to us if celebrities like Ashton Kutcher and Demi Moore use the iPhone? Do we care if they increasingly make their presence felt on Twitter? And does their choice of iPhone Twitter client influence our own preference? And either way, what does it tell us about the iPhone, Twitter, and the celebrities who choose to use them? (You can answer below, or on Twitter from your favorite iPhone client for extra irony points!)
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.