Most of the time Facebook, LinkedIn and other accounts seem like benign tools — until they get hacked. Both named services offer Multi-Factor Authentication to help keep your accounts under your control.
To enable MFA on Facebook, go to: Settings → Security and Login → Two-Factor Authentication. On LinkedIn, go to: Settings → Sign in & security → Two-step verification.
On Facebook, you can also review and revoke Authorized Logins to your account and even get special App Passwords for use on your phone, devices, and websites. This is worth doing — many people are surprised to find devices they no longer own still listed as authorized.
Consider what you make public. Every piece of personal information you share publicly gets added to the data profile assembled from the many third-party breaches that happen every year. Also consider identity monitoring services. They are no longer optional — they are necessary.
— Robert