To delete your watch history on Facebook, access your Activity log and clear the videos you've watched. Deleting your watch ...
To visit the Google My Activity Page, go to myactivity.google.com. On the ‘My Activity Page’, you will find your activities from different Google Products like Search, Image Search ...
Scroll down to the section marked Your Facebook Information, and tap "Activity Log." 4. On the Activity Log page, tap "Category" at the top of the page and scroll to choose "Hidden From Timeline." ...