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Barack Obama
This account is run by #Obama2012 campaign staff. Tweets from the President are signed -bo.16,170,153 followers | Follow
CNN Breaking News
CNN.com is among the world's leaders in online news and information delivery.7,630,261 followers | Follow
Breaking News
Breaking news alerts around the world from hundreds of sources 24 hours a day. Get more on BreakingNews.com, and follow our team on @breaking.4,098,002 followers | Follow
The White House
Official WH twitter account. Comments & messages received through official WH pages are subject to the PRA and may be archived. Learn more http://wh.gov/privacy2,900,889 followers | Follow
Pete Cashmore
The largest independent website dedicated to news & resources for the connected generation. Tweets from @mashable staff. Send questions/comments to @mashablehq.2,880,783 followers | Follow
National Geographic
Since 1888, we've traveled the Earth, sharing its amazing stories with new generations. Official Twitter account of National Geographic.1,914,005 followers | Follow
Al Jazeera English
Al Jazeera English, the 24-hour English-language news and current affairs channel, headquartered in Doha, Qatar. Follow @AJELive for breaking news alerts.1,043,530 followers | Follow
Guy Kawasaki
Author of Enchantment: The Art of Changing Hearts, Minds, and Actions. Former chief evangelist of Apple. Co-founder of Alltop.932,720 followers | Follow
Asteroid Watch
JPL's Near Earth Object Office coordinates NASA's efforts to detect, track & characterize potentially hazardous asteroids & comets that could approach Earth.874,822 followers | Follow
Neil deGrasse Tyson
Astrophysicist, American Museum of Natural History. Author: Space Chronicle, The Pluto Files,. Host: StarTalk Radio http://StarTalkRadio.net494,089 followers | Follow
Scientific American
Scientific American Magazine and online, over 165 years of science news368,514 followers | Follow
Ars Technica
Original news and reviews, analysis of tech trends, and expert advice on the most fundamental aspects of tech and the many ways it's helping us enjoy our world.354,382 followers | Follow
TweetSmarter
In our fifth year of helping everyone get the most out of #Twitter and #SocialMedia. Tweet us anytime! Tips, tools, Twitter news and tech support for everyone.332,203 followers | Follow
The QI Elves
Quite Interesting nuggets, posted as frequently as Mr Fry's strict homework schedule allows.264,141 followers | Follow
Science Friday
Sci/tech radio program on NPR; video, Twitter (@scifri, @sci_arts) and Facebook/scifri. Got ideas? Write and tweet us @scifri all week and during the show.213,538 followers | Follow
Democracy Now!
Official Democracy Now! Twitter Account. An independent, global daily news hour. Follow us for daily news, events, and updates on Amy Goodman's speaking tour.169,729 followers | Follow
Tech Aggregator
Follow and you will get best of Apps and Products that are out there. Follow us and you will not be disappointed! #teamfollowback138,580 followers | Follow
Roland Garros
Roland Garros / French Open / Internationaux de France / Roland Garros 2012 : From May 22nd to June 10th. #RG12137,152 followers | Follow
USOpen.org
The Official Twitter of the US Open Tennis Championships. 2012 Dates: August 27 - September 9133,805 followers | Follow
National Wildlife
National Wildlife Federation works to inspire Americans to protect wildlife for our children's future. Staff updating: @starfocus @rarewildlifeguy @ksuzj89,664 followers | Follow
Australian Open
Welcome to the official account of the Australian Open, the Grand Slam of the Asia Pacific. Join the conversation #ausopen. 14–27 Jan 2013.84,140 followers | Follow
Discovery_News
DiscoveryNews.com, a Discovery Channel website that covers the latest science news on tech, gadgets, animals, space, adventure, autos, history and earth.74,943 followers | Follow
HowStuffWorks.com
Random facts, the latest articles and what's happening at the office, brought to you by Site Director Tracy, Editor Holly and Senior Writer Robert.55,824 followers | Follow
NASAEyesOnTheEarth
Being rocket scientists isn't enough...we're climate scientists too! News from NASA on all things climate.38,197 followers | Follow
ESPNTennis
LEGAL NOTICE: If you send us a tweet, you consent to letting ESPN use and showcase it in any media, possibly even on television.35,088 followers | Follow
Disinformation
activism, alternatives, corporation watch, counterculture, current events, freethinking, politics, strange science, the unexplained, war on drugs and terror...26,418 followers | Follow
Wolfram|Alpha
Your official source of news about the computational knowledge engine, Wolfram|Alpha25,529 followers | Follow
Penn State
Official Twitter stream of Penn State University. For news: @pennstatelive20,117 followers | Follow
Penn State Live
Penn State, the world's most popular University, has conferred more than 700,000 degrees since 1855. Our Alumni Association is the largest anywhere. We Are...19,439 followers | Follow
Wired Top Stories
RSS Feed of top news, articles, and reviews chronicling innovation and its impact on technology, culture, business, and science.14,835 followers | Follow
Astronomy Magazine
Astronomy informs, entertains, and inspires people who are interested in the science and hobby of astronomy.14,616 followers | Follow
