Continuing our series of Twitter-using celebs worth keeping up with, here are 10 more celebrities merrily micro-blogging away.

1. Justin Bieber
He’s an absolute sensation on Twitter, with his name often trending in the top 10 Twitter trends. His account is used mostly for outreach to his fans and career promotion, but it’s a useful way to keep in touch for hardcore fans. Sample tweet: so in 1 week…next tuesday…the song I wrote about how how all of u make me feel….. SMILE hits ITUNES

2. Barack Obama
The President of the United States has had an Twitter account seemingly forever, using it actively during campaigning. Or more to the point, his aides were using it actively. His very first real tweet came after the Haitian earthquake as part of a charity appeal. If politics is your bag, this is one to watch. Sample tweet: Speaking about the urgent need for health insurance reform this morning at Arcadia University – watch live at 11:00am ET http://j.mp/dvUmn2

3. Kevin Pollak
This actor tweets a bit of everything and is pretty actively networked in the Twitter community. He can often be found retweeting other celebrities, so his account is a great way to discover other high profile folks. Sample tweet: Fav Fact Tweet of the day: RT @jaime_fox I had to see Capt EO twice today just because it’s so 80s cheesetastic!!!

4. Jared Leto
This actor turned musician is a very active Twitter user, although his tweets are mostly pertinent to his career, especially his experiences with his band. His band, 30 Seconds to Mars, also has a Twitter account. Sample tweet: Haaa Who threw these glasses on stage and whered they go? RT @thisismadeline: http://twitpic.com/178l53 – I love this photo soo much

5. Yoko Ono
The widow of late legend John Lennon tweets mostly words of wisdom, some profound and some rather mystifying, but all of them thoughtful. Sample tweet: Draw a window on the wall to remind you of the fog that covers your worries

6. Neil Patrick Harris
This charismatic actor tweets from the heart with lots of content about his professional life and random thoughts stream-of-consciousness style. Sample tweet: Being asked to open the Oscars – Awesome. Rehearsing and performing – Awesome. Reading some of the vitriolic reaction – Not quite so much.

7. Lindsay Lohan
If you ever wanted to know what day-to-day life was like for…and the inner workings of the mind of…actress Lindsay Lohan, her Twitter account will answer all your questions. Sample tweet: http://twitpic.com/17ju1z – hmmm? what kind of face am i making?! i’m confused? Lol

8. Imogen Heap
This British singer took Twitter to a whole new level when she accepted a Grammy award in a dress actually wired to Twitter, displaying photographs submitted by Twitter-going fans. Sample tweet: Last night’s gig was so special for me. Just managed to hold it together for Hide and seek. Copenhagen… You sang beautifully! Much love x

9. Moby
Musician and activist Moby seems to tweet whatever interests him, professionally or otherwise. Often his tweets contain recommendations or commentaries on hot topics like politics. Sample tweet: “We used to hustle over the border for the health care we received in Canada” – Sarah Palin. again: ah, republicans…the party of comedy.

10. Ashton Kutcher
A very active Twitter user, the often imitated but never duplicated actor is rather difficult to pin down. A blend of photographs, personal tidbits & professional news can all be found in the mix. Fans will likely enjoy the randomness. Sample tweet: Time for a hair cut. I’m starting to look like Justin Beiber http://yfrog.com/4v45ecj

Related: John Mayer & More: Top 10 Celebs to Twitter Stalk [pt 1]

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Ashton Kutcher, Barack Obama, celebrities, celebrity, imogen heap, Jared Leto, Justin Bieber, kevin pollack, Lindsay Lohan, micro-blog, micro-blogging, Neil Patrick Harris, Social Media, social network, Social Networking, Twitter, Yoko Ono