Top stories
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Apple creates 2,000 jobs shifting production back to US
Technology company's renewable energy-powered Arizona laboratory set to grow sapphire crystals for fingerprint scanners. By Juliette Garside
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Bitcoin could be hijacked by 'selfish' groups causing currency collapse
Conditions already exist for abuse by collective computational power to cause breakdown in digital currency, say researchers. By Samuel Gibbs
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Why BlackBerry failed
Charles Arthur: Did BlackBerry just get too old? No – the smartphone company had opportunities to adapt and survive, but it took the wrong direction
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Jeff Bezos' wife slams 'misleading' biography
'Everywhere I can fact check from personal knowledge, I find way too many inaccuracies,' writes MacKenzie Bezos in Amazon review. By Stuart Dredge
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Google chairman angry at NSA data spying
Eric Schmidt says company has lodged complaints with NSA, White House and Congress as criticism hardens in Silicon Valley
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What is Tor? A beginner's guide
The anonymity software has sparked controversy but who built it, what is it used for, what browser does it use – and why is the NSA so worried by it? By Stuart Dredge
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Randi Zuckerberg warns of social media's risks
Facebook founder's sister suggests adults and children should limit time online in two new books. By Liz Bury
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GTA Online 'stimulus package' set to drop
Rockstar to give $500,000 of virtual cash to gamers – but it will only be available to those who played in its first month. By Keith Stuart
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Twitter claims $13.6bn market valuation
'Elite' social media company raises its IPO asking share price by 25% and reveals IBM has accused it of violating three patents. By Heidi Moore
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Katy Perry beats Justin Bieber to top Twitter
Star passes 46.5m followers on social network, with musicians accounting for four of the five most-followed accounts on Twitter. By Stuart Dredge
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Vine: ready for your six seconds of fame?
With more than 40 million users, video-sharing mobile phone app Vine has a global reach. How did it get so big and what does Vine mean for the future of creativity, asks Dominic Rushe
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Why the Obamacare website was doomed
The shambles of Barack Obama's healthcare launch recalled many similar British computer meltdowns, writes John Naughton
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Apple's head of iOS leaves after 23 years
Henri Lamiraux ran Apple's development teams for the iPhone and iPad operating system and pioneered visual voicemail. By Samuel Gibbs
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