[ (you need an account to see links) ]
According to Yahoo, they said that up to 1 billion accounts could have been compromised in 2013.
They had already had 500 million accounts hacked before.
"In both attacks, the stolen information included names, email addresses, phone numbers, birthdates and security questions and answers. The company says it believes bank-account information and payment-card data were not affected."
If you're a Yahoo user, you should definitely update your info... Or switch to a more secure email lol