Facebook said on Friday that hackers stole digital login codes allowing them to take over nearly 50-million user accounts in its worst security breach ever given the unprecedented level of potential access, adding to what has been a difficult year for the company’s reputation. Facebook, which has more than 2.2-billion monthly users, said it has yet to determine whether the attacker misused any accounts or stole private information. It also has not identified the attacker’s location or whether specific victims were targeted. Its initial review suggests the attack was broad in nature. CE Mark Zuckerberg described the incident as “really serious” in a conference call with reporters. His account was affected along with that of COO Sheryl Sandberg, a spokeswoman said. Shares in Facebook fell 2.6% on Friday, weighing on major Wall Street stock indexes. Facebook made headlines earlier this year after profile details from 87-million users was improperly accessed by political data firm Cambr...

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