On 28th August there was a massive data breach with 711,477,622 unique email addresses, many of which were also accompanied by corresponding passwords being pwned.
What should I do?
You can check here to see if any of your accounts were pwned.
https://haveibeenpwned.com/
If you have been reusing and sharing the same password for different accounts and websites now is a very good time to change that and create strong unique passwords for every account you have!
Read more about the breach here
https://www.troyhunt.com/inside-the-massive-711-million-record-onliner-spambot-dump/