Include and configure extension TypoScript.
The best way for facebook access_token is to use a never expiring token. Have a look at: https://www.rocketmarketinginc.com/blog/get-never-expiring-facebook-page-access-token/
Configure a cronjob for Cli command: ./typo3/cli_dispatch.phpsh extbase import:run
This import command will import and the review database table.