Quick info to everyone here:
Your other accounts were not directly affected here. If you're using Google, Facebook, Twitter,... to log in, the account is safe thanks to the way OAuth works. Though your account may have been affected if you logged in within about one and a half hours before the front page was changed, though I hardly believe more than five people were online at that time.
Here's some good practices:
- Change passwords regularly
- Use 2FA on as many accounts as possible
- Look on your browser's URL bar when logging in to ensure the entire page is protected by a security certificate
- Use a password that is as long as possible, that uses as many special characters as possible and that you can't remember. Using password managers (1Password, LastPass,...) is fine too as these are secure.
- Don't use the same password on every site.
Again, if you are logging in with Twitter, Facebook or Google no password is shared so you're safe if you use passwords based on the above criteria.