Celebrities on Twitter

What are they doing?

From daily minutiae and personal marketing to social causes and news, these boldface names are keeping the public informed (in 140 words or less, of course.) Here's a round-up of just some of the celebrities you'll find on the popular microblogging site Twitter. Who are you following?
Nicole Cammorata, Boston.com Staff
Oprah Winfrey

Oprah Winfrey

The TV maven is relatively new to Twitter, having just joined on April 17 during a live taping of her show. Winfrey had a major effect on the site, causing visits to jump by 24% on the day she joined. Expect plugs for the show along with personal updates, like "In the makeup chair, reading script for today's show. SHOCKING video! Don't miss the beginning." Follow Oprah Winfrey at Oprah.
Ashton Kutcher

Ashton Kutcher

With everything from pictures of "wifey" Demi Moore to life updates and genuine back and forth with followers, Kutcher is the resident Twitter king. He recently won a challenge by news network CNN for who could reach one million followers first, with Kutcher surpassing the competition. Follow Ashton Kutcher at aplusk.
Ryan Seacrest

Ryan Seacrest

Celebrity news and "American Idol" updates mark Seacrest's frequent tweets. Though he's the resident gatekeeper of entertainment news with more than 700,000 followers, he maintains a steady stream of personal tidbits (like what he's eating) as well.
Follow Ryan Seacrest at RyanSeacrest.
Demi Moore

Demi Moore

There's not much substance to her tweets, which seem to be mostly back-and-forth with the twitterati and can be anything from "Maybe I had too long of a work day and not enough twitter time!" to "It could be Fri if I wanted it to...couldn't it?," but boy does she like to post them.
Follow Demi Moore at MrsKutcher.
Hugh Jackman

Hugh Jackman

The Australian actor uses his account as an outlet to plug, support, and encourage various charities and causes. Recently, Jackman posted that he'd "donate 100K to one individual's favorite non profit" if they could convince him in 140 characters or less. (Charity Water and Operation of Hope won.) Follow Hugh Jackman at RealHughJackman.
Perez Hilton

Perez Hilton

If Seacrest is the gatekeeper then Hilton is the key master of celebrity news and gossip. The notorious (and ruthless) blogger's feed, which often has a PG-13 rating, is peppered with music recommendations, social commentary, and input from the A-listers themselves.
Follow Perez Hilton at perezhilton.
Ashlee Simpson Wentz and Pete Wentz

Ashlee Simpson Wentz and Pete Wentz

The couple that Twitters together stays together? A coterie of famous pals (and family) that includes Nicole Richie, Jessica Simpson, Tina Simpson, John Mayer, and Mark Hoppus factors heavily into feeds. Posts to each other keep the pair in constant contact. Follow Ashlee Simpson Wentz at ashsimpsonwentz and Pete Wentz at petewentz.
Samantha Ronson

Samantha Ronson

Keep up with the celebrity DJ's tweets on music, pop culture, things she likes, and responses to fellow micro-bloggers, both famous and not. Just don't expect to find any mention of former flame Lindsay Lohan.
Follow Samantha Ronson at samantharonson.
Sean 'Diddy' Combs

Sean 'Diddy' Combs

The rapper and hip hop impresario keeps a steady feed of promotional plugs, inspirational one-liners, and courtside messages. He was a vocal supporter of Ashton Kutcher's quest for followers and appeared on CNN with the actor after he reached one million.
Follow Sean "Diddy" Combs at iamdiddy.
Erykah Badu

Erykah Badu

The singer made headlines last February when she provided live updates via Twitter during the birth of her daughter Mars Merkaba (when she was in labor, how close the contractions were) with boyfriend Jay Electronica. Badu's account requires permission to follow.
Follow Erykah Badu at fatbellybella.
John Mayer

John Mayer

In addition to filling in followers on his music and songwriting, Mayer's occasional non-sequiturs can be (gasp!) funny. Example: "I don't like food words used not for food: marinate on that, deliciously funny, tasty guitar playing, digesting what you're saying, etc."
Follow John Mayer at johncmayer.

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