After selecting the posts, click Next > Delete Posts > Done. Click Manage Posts and then check the option Select All. Go to your Facebook profile by clicking on your profile picture in the top right corner of the window. Youll only be able to see posts and comments that youve made, not comments that others have made on your posts. Find a post or comment you want to delete. Scroll down and tap 'Settings.' Select 'Activity Log' from the menu. Sometimes you regret a Facebook comment but you can't fin. iPhone - Tap the More button () in the lower-right corner of the Facebook app.