Here's how to delete all Facebook posts at once and archive your activity with the Manage Activity tool in a web browser or in the mobile app. Show Bulk Delete Posts Using Facebook in a Web BrowserThe 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 couple of ways to do that, including filtering posts if you want to delete something specific.
How to Manage Your Posts in the Facebook AppIn the Manage section of Facebook settings, you can delete, archive, or restore content. This feature is currently only available on the Facebook mobile app.
Can't Delete Some Posts?You might notice that when you try to delete some posts, the deletion option is grayed out, and you can only select the hide option. This might occur for specific posts like profile picture updates, posts that weren't created by you, or posts with particular privacy settings. For posts you're unable to delete using the manage posts option, you can delete those posts individually. Find the posts on your Timeline, select the three dots in the upper-right corner of the individual post, and select Delete. Consider limiting your past posts in your settings, so previous posts you shared with friends of friends or the public are changed to be shared with only your friends. On Facebook.com, select the down arrow then choose Settings > Privacy > Limit Past Posts. Select Limit Past Posts to confirm. This setting doesn't appear to be accessible in the mobile app. How to Delete Your Activity Log on Facebook FAQ
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