@ 06/05/2019 stop working (is at version 1.4.12) https://chrome.google.com/webstore/detail/social-book-post-manager/ljfidlkcmdmmibngdfikhffffdmphjae
others https://www.addictivetips.com/web/mass-delete-facebook-posts/ https://www.qualisoft.co.il/facebook-cleaner
not tried - https://greasyfork.org/en/scripts/9106-facebook-timeline-cleaner
origin - https://www.pipiscrew.com/?p=14878 social-book-post-manager