With Oprah Onboard, Twitter Grows - NYTimes.com

One small message from Oprah, one giant leap for Twitter.

On Friday morning, Twitter received the blessing of Oprah Winfrey, one of Middle America’s most influential tastemakers, when Ms. Winfrey tapped out her inaugural messageusing the microblogging service as the cameras of her talk show cameras rolled.

“HI TWITTERS,” Ms. Winfrey wrote, using all capital letters in the Internet equivalent of shouting. “THANK YOU FOR A WARM WELCOME. FEELING REALLY 21st CENTURY.”

The popularity of Twitter, which allows users to broadcast messages of 140 characters or less, has been soaring in recent months. In March, the service had more than 14 million unique visitors, compared to eight million visitors in February. Ms. Winfrey’s endorsement is only likely to draw more attention to the San Francisco start-up and propel it beyond its niche audience.