1. http://breachlevelindex.com/
2. Database of 1.4 Billion Credentials Found on Dark Web.
https://www.securityweek.com/database-14-billion-credentials-found-dark-web
3. How APPLE and AMAZON Security Flaws Led to My Epic Hacking.
https://www.wired.com/2012/08/apple-amazon-mat-honan-hacking/
4. LinkedIn Lost 167 Million Account Credentials in Data Breach.
http://fortune.com/2016/05/18/linkedin-data-breach-email-password/
5. Passwords for 32M Twitter accounts may have been hacked and leaked.
https://techcrunch.com/2016/06/08/twitter-hack/