(CNN) -- As Ashton Kutcher becomes the first to collect 1 million followers on Twitter and Oprah Winfrey sends out her first tweet, tech observers are debating: Does Friday mark a new peak for the microblogging service? Or the beginning of its demise? Ashton Kutcher told Larry King Friday that the battle was about proving one person can have a voice. Some bloggers and Twitter users have expressed concern that the once-cultish site is being overwhelmed by celebrities and media hype, while others are excited by Twitter's ever-growing reach. "It's a big milestone. This brings Twitter mainstream," said Andrew Cherwenka, a Huffington Post contributor and Web developer at Trapeze.com, referring to Kutcher and Winfrey's Twitter breakthroughs.
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NEW: Ashton Kutcher: "It's really about everyday people having a voice"
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NEW: Kutcher: I realized I could use Twitter to "effectively change the world"
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Oprah Winfrey, Ashton Kutcher taking Twitter's popularity to new heights
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Kutcher beat CNN early Friday in a race for 1 million followers on the site
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"A lot of people are saying this is going to be the death of @placeholder, and I don't understand that at all," Cherwenka added.
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By Friday afternoon her @placeholder following had climbed above 100,000.
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Cherwenka, the @placeholder blogger, believes Kutcher may be one of the first people to leverage the power of online social networking for widespread social good.
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Cherwenka, the Huffington Post blogger, believes @placeholder may be one of the first people to leverage the power of online social networking for widespread social good.