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The words "four more years", coupled with a photo of Barack and Michelle Obama embraced in a hug, have become the most retweeted Twitter post ever. The US president tweeted the message at 0416 GMT, and it has since been retweeted over half a million times. It underlined the now pivotal role social media plays in informing and persuading potential voters.

Everyone's made a joke they thought was funny only to see it fall flat, but Park Jung-geun's attempt at humor could see him jailed for up to seven years in South Korea. Park, a photographer by profession, re-tweeted some messages from North Korea's official twitter feed, such as reports on the late leader Kim Jong Il's travels across the country and negative tweets about South Korea.

Don't be a denialist. Instead put on your jeggings (breathe in) or mankini (be careful) and retweet this article. After all, it's hip to be in the know on the 400 new words and phrases in the 12th edition of Concise Oxford English Dictionary, the abridged version of the Oxford English Dictionary. The smaller dictionary is meant to "cover the language of its own time."

Are those who post unverified reports on Twitter playing an important role in the new ecosystem of news, or being irresponsible and indulging in gossip? That question goes to the heart of the idea of news as a process rather than a finished product.

So many people love Justin Bieber. They love him so much, that this year Twitter changed the way it counts its most tweeted-about topics to effectively exclude him....

You know how TweetMeme started out trying to be the Techmeme of Twitter before it ventured off plastering its ReTweet buttons on every blog on the Web?

How do you measure influence on Twitter? While follower count is perhaps the most obvious metric, other activities, like the numbers of times you’re retweeted, provide a bit more insight.

One of the best things about Twitter is the way that it allows content and information to spread quickly across the network from person-to-person. This happened for two reasons: 1. because Twitter is a one-to-many communications platform and 2. because it allows for content to be easily repeated.

At this point, a fair number of Twitter users have the new retweet feature enabled (and if you’re not one of them, don’t worry, the rollout continues).

An avid Twitter user, Alana Taylor wrote a song about the social networking site and uploaded it to YouTube last April. Soon, her Twitter feed became flooded with messages linking to it.