Tech company had previously claimed it only "recently" found out about the leak of 500m user's personal information
Breach of 500 million users’ accounts is ‘material’ to deal, says telecoms firm
Government surveillance could 'undermine privacy' says freedom of expression expert David Kaye
The giant is said to be the first US internet company to agree to such a blanket request
Many of the accounts are old and unused, and login details for sites such as Flickr are thought to be caught up in the attack
Yahoo is already haemorrhaging users, traffic and advertising to rivals Google and Facebook - the leak of half a billion users personal details will magnify its problems.
Yahoo will be informing people if their personal information was disclosed – but it’s worth proceeding if you’ve been caught up in the hack either way
Your bank, your health insurer and even your favorite stores have also had their customers' data stolen by hackers.
She's regularly pulled off all-nighters during her time at Google
Uber admitted in February that it was losing around $1bn per year in the country amid fierce competition
The company is now far more than just a social network and has blown Wall Street away with its latest results. But should we be concerned about its growing power?
Mr McAdam aims for the company to lead on digital video, sports, finance and news
Yahoo shareholders are fed up with a downturn in the company's revenue
The huge database is one of the biggest ever discovered
Yahoo has been looking for a buyer for its core business since February
The company is under intense pressure to revive its revenue growth and shareholders are calling for a change in leadership