Winfrey posted her first Tweet during The Oprah Winfrey Show on April 17, which featured Kutcher and Twitter CEO Evan Williams. As of that afternoon, @Oprah had more than 138,000 followers.
On April 14, Kutcher challenged CNN to see who could get to 1 million Twitter followers. CNN reported that, as of Wednesday afternoon, Kutcher had 896,947 followers which the media outlet had 937,787. Kutcher ultimately beat the news network to the mark on April 17.
Oprah, who has done shows on Facebook and YouTube in the past, decided to join Twitter so she could experience the social network.
"Our Oprah's Friday live shows are always about what is making headlines and what is in the news, so we wanted to talk to Ashton Kutcher about his quest for 1 million Twitter followers and the challenge with CNN," said Don Halcombe, a spokesperson for Harpo Productions. "I think [Oprah's participation] evolved as part of that conversation and it made more sense to talk about [Twitter] through actually participating in that technology."
Harpo Productions did not do any media outreach prior to the announcement on Friday, Halcombe said, but Williams (@ev) and Kutcher (@aplusk) both mentioned it on their Twitter accounts.
As for whether or not Winfrey will monitor the account herself, Halcombe said, "She just started Tweeting [on Friday], so we'll see how she wants to use it."