Zynga shares plunge after poor third quarter figures

Games company behind Farmville and Mafia Wars cuts outlook for year, blaming delays in new titles

Facebook passes 1bn user mark

Mark Zuckerberg, founder of the social networking site, describes milestone as 'the thing he is most proud of'

Facebook accounts could be used to prove identity to access public services

Government to publish list of certified providers that can help people login securely to revamped gov.uk portal

King.com hails mainstream potential of mobile gaming

CMO Alex Dale says players not looking for 'a whole load of grinding for cities, castles or farms'. By Stuart Dredge

Twitter chief says company will fight against releasing private content

Dick Costolo says site was 'put between a rock and a hard place' when judge ordered release of Occupy activist's tweets

Twitter redesign makes more of photos

Users' profiles get large new header pictures, while their photo streams appear below their most recent tweets. By Lisa O'Carroll

Facebook and Twitter: the art of unfriending or unfollowing people

When even 'unfriending' someone on Facebook seems like a terrible snub, how do you declutter your social circle? Oliver Burkeman investigates

Pass notes No 3,246: back injury

Xi Jinping, tipped to be the next president of China, has not been seen in public for a while. Rather than explain his absence, the authorities have banned a certain search term from a social media site

Topshop to turn London fashion week show into Facebook ‘entertainment’

Users will be able to customise clothes and accessories as they appear on the catwalk

Facebook’s stock market debut disappointing, says Zuckerberg

Social networking site's co-founder has given his first interview since the company's disastrous initial public offering

Facebook excommunicates New Yorker for original sin – nipple bulge

Media Monkey: Two small reasons why the social networking site banned publication's cartoon

Pass notes No 3,236: Spike Wells

Could Prince Harry have been sharing his life with his friends on Facebook under the name Spike Wells?

Is Twitter anything more than an online echo chamber?

Laura Marcus: Columnists Suzanne Moore and Peter Hitchens rarely see eye-to-eye on anything, but they do seem to agree that Twitter tends towards a leftwing mob mentality

Silicon Valley investor Peter Thiel cashes in Facebook shares

Former PayPal chief sells 20m Facebook shares – making him $1bn from the social network's IPO

I’d never boast about it, but I’m a master of the new art of underbragging

Oliver Burkeman: Now everyone is bragging on Facebook and Twitter, the really smart people are developing new ways of promoting their magnificence