After installing Sierra, websites are tracking me like crazy! That did not happen before. Why is this happening and what can I do to stop it?

What are your Privacy settings in Safari Preferences.

There may be several Location-related items enabled.

These would allow many places to track you by location

and advertisements could appear for localized business.

Another group of settings to become familiar with, it appears? 😉

Have you checked the Security and Privacy settings in Safari Preferences?

Also check for updates to extensions. Maybe an extension you were previously using is not compatible with the newest version of Safari.

How are you determining that a website is tracking you?

Hi dee.dee

In addition to checking your safari privacy settings (location, cookies, etc) i would advise to use this ad (and tracker) blocker : https://adguard.com/en/adblock-adguard-safari.html