It was just announced that back on May 11th, Edmodo was hacked and 77 million records were stolen. These include usernames, email addresses, and hashed passwords.
If you have an Edmodo account, I’d like to suggest you go in and change your password. And if you use that email/password combination on any other sites, I’d change those as well.
Also, this site will tell you if your email address was part of a breach. It will also send alerts to inform you of new breaches. https://haveibeenpwned.com
Be safe, everyone!