https://www.theverge.com/2018/8/1/17639930/reddit-hack-security-breach-stole-user-data-2007-earlier

Reddit informed its users today that a hacker broke into some of its systems and accessed user data, including current email addresses and a 2007 database that contained usernames and passwords that were already salted and hashed (or scrambled for protection).

Reddit is sending an email to all affected users — mostly people who joined Reddit in 2007 or earlier. The hacker was also able to read the email digests Reddit sent out in June 2018 as well, so they could see users’ email addresses and relevant, safe-for-work subreddits they followed. Reddit is recommending users who may still be using passwords similar to the ones they had in 2007 to change their password on Reddit and other sites.