Almost 100 million accounts have been compromised, says security expert. Around 272.3 million users worldwide are thought to have been affected. Majority of the usernames stolen are from Russias most popular email service Mail.ru. Credentials from around 40 million Yahoo Mail accounts, 33 million Hotmail accounts and 24 million Gmail accounts. The information is being traded in the cyber underworld for next to nothing, it has been claimed. A young Russian hacker was bragging in an online forum that he had collected and was ready to give away a larger number of stolen credentials.”]