Stack Overflow has more than 10 million registered users and it has over 50 million unique visitors every month. The Q&A platform is the most important website of the Stack Exchange Network. Unknown hackers breached its systems and accessed 100 million user data, exposed data included names, email addresses and hashed password. The company immediately launched an investigation and has found no evidence that customer or user data was compromised. In December 2018, another popular Q/A platform, Quora, revealed to have suffered a data breach.”]
Source: https://securityaffairs.co/wordpress/85706/data-breach/stack-overflow-data-breach.html