<meta property="og:title" content="{if $meta_title != ''}{$meta_title}{else}Мой сайт{/if}">
<meta property="og:description" content="{if $meta_description != ''}{$meta_description}{else}{$data.text.value|truncate:200}{/if}">
<meta property="og:image" content="http{if $smarty.server.HTTPS ne ''}s{/if}://{$smarty.server.HTTP_HOST}/img/data/{$photo[0].normal}" alt="{$title}">
<meta property="og:type" content="website">
<meta property="og:type" content="http{if $smarty.server.HTTPS ne ''}s{/if}://{$smarty.server.HTTP_HOST}" />
<meta property="og:url" content="http{if $smarty.server.HTTPS ne ''}s{/if}://{$smarty.server.HTTP_HOST}{$smarty.server.REQUEST_URI}">
<meta property="og:site_name" content="{$title}">
<meta property="og:logo" content="http{if $smarty.server.HTTPS ne ''}s{/if}://{$smarty.server.HTTP_HOST}/template/frontend/{$current_theme_name}/img/logo.png" alt="">
<meta property="og:locale" content="ru_RU">
в тег html
<html xmlns:og="http://ogp.me/ns#"/>