My Permissions Check which applications, services or third parties have connection to your online identities.
Useful for checking permissions that you may have granted to your Facebook, Twitter, Google or other online accounts.
Facebook Security Checkup Security Checkup will help you: Log out of Facebook from unused browsers and apps. Get login alerts that notify you if someone tries logging into your account from a new computer or phone. Learn how to protect your password.
Have I Been Pwned – Websites Websites that have been compromised
Here's an overview of the various breaches that have been consolidated into this site. Each of these has been dumped publicly and is readily available via various sites on the web. This information is also available via an RSS feed.