Verizon said that Yahoo's 2013 data breach involved not 1 billion user accounts, but 3 billion -- every single Yahoo account at the time.
Oops! Yahoo Says 3 Billion Accounts Hacked, Not 1 Billion : Read more
Target disclosed 70 million more people were hit by last fall's data breach, which initially affected 40 million credit and debit cards.
Target Data Breach Widens to 70 Million More Individuals : Read more
Logging into third-party websites using your Facebook credentials is convenient -- but it also gives a lot of personal information to websites that may not be secure.
Is It Safe to Sign Into Other Sites Using Facebook? : Read more