Even Facebook CEO Mark Zuckerberg shared the same password - dadada - for both Twitter and Pinterest accounts, to hack them in 2016 by a group called OurMine.
There are also a number of ways for companies like Google and users to protect themselves. Researchers use two-factor authentication or password management applications to create separate passwords for each page, avoid duplication, especially don't use simple and easy-to-guess passwords like '12345'.
Anyway, 'password is something we can no longer trust,' said Kurt Thomas, a researcher at Google.
Readers interested in Google reports can read more here.https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/46437.pdf