1. Facebook functionality isn't built into the theme but you can try plugins such as "ShareThis" suggested on our
recommended plugins page for the like button. You may need to read more about the plugin itself to see if it also requires the users permission to post user activity on Facebook as well.
2. There is no setting within the Vantage admin to turn the favorites off, so this would require some customization on your part if you wanted to remove it.
3. As with the favorites, there is no specific setting to turn this off.
4. The review is a required field by default, so it would require customization if you were to make this optional. Thanks.