Here's how to delete all Facebook posts at once and archive your activity using the Manage Activity tool in a web browser or mobile app.
How to Bulk Delete Old Facebook Posts
The first step to deleting your old Facebook posts is to select the posts you no longer want (up to 50 at a time). There are a few ways to do this, including filtering posts if you want to delete something specific.
Go to Facebook.com or open the Facebook app and log in to your account. Select your name or profile icon in the upper left corner or in the menu bar to go to your profile.
Select 'Manage Messages' under the message composer.
