以下是您在子网站上强制注册的操作：

/**
 * Require registration for comments on subsites too.
 */
function ourcomments_pre_option_comment_registration( $value )
{
        return 1;
}
add_filter( \'pre_option_comment_registration\', \'ourcomments_pre_option_comment_registration\', 10, 1 );

要仅显示用于登录的社交按钮，可以使用以下方法：

/**
 * Hide login fields. Only social logins.
 */
function ourcomments_only_social_logins_login_form() {
?>
  <script type="text/javascript">
(function() {
    // Some things seems to be added later, hide them. And display site name.
    var cssHide = "";
    cssHide += "div#login h1 a { background:none; text-indent: 0; font-size: 30px; font-weight: bold; width: auto; height: auto; color: black; }";
    function checkAndRemove(el) {
        if (el) {
            var elP = el.parentElement;
            if (elP && "P" !== elP.nodeName) elP = elP.parentElement;
            if (elP && "P" === elP.nodeName) {
                elP.parentElement.removeChild(elP);
            }
        }
    }
    checkAndRemove(document.getElementById("user_login"));
    checkAndRemove(document.getElementById("user_pass"));
    // checkAndRemove(document.getElementById("rememberme"));
    cssHide += " div#login form#loginform p.forgetmenot { display:none }";
    // checkAndRemove(document.getElementById("wp-submit"));
    cssHide += " div#login form#loginform p.submit { display:none }";

    // Remove lost password (looks easily breakable...):
    var navLostPassword = document.querySelector("div#login p#nav")
    if (navLostPassword)
        navLostPassword.parentElement.removeChild(navLostPassword);
    else {
        console.log("p#nav not found");
        cssHide += " div#login p#nav { display:none }";
    }

    // For Nextend:
    var nextendOr = document.querySelector("div#login form#login-form h3");
    if (nextendOr)
        nextendOr.replaceChild(document.createTextNode("Please login!"), nextendOr.firstChild);
    else {
        console.log("h3 not found");
        cssHide += " h3 { display: none; }";
    }
    var s = document.createElement("style");
    s.appendChild(document.createTextNode(cssHide));
    document.body.appendChild(s);
})();
  </script>
<?php
}
add_action(\'login_form\', \'ourcomments_only_social_logins_login_form\', 1000);
add_action(\'register_form\', \'ourcomments_only_social_logins_login_form\', 1000);
add_action(\'bp_sidebar_login_form\', \'ourcomments_only_social_logins_login_form\', 1000);

由于社交按钮的插件不会将其放置在子站点上，因此您可能希望通过主站点登录：

/**
 * Login through main site.
 * Mostly a copy of the wp_login_url in general-template.php.
 * Fix-me: move to plugin.
 */
function ourcomments_network_login_url($login_url, $redirect) {
    $net_login_url = network_site_url(\'wp-login.php\', \'login\');

    $my_redirect = $redirect;
if ( empty($my_redirect) )
            $my_redirect = $_SERVER[\'REQUEST_URI\'];
if ( !empty($my_redirect) )
    $net_login_url = add_query_arg(\'redirect_to\', urlencode($my_redirect), $net_login_url);

    // We do not have the $force_reauth arg but we know how it looks in the url.
    $values = parse_url($login_url);
    $query = $values[\'query\'];
    parse_str($query, $output);
    if ( $output[\'reauth\'] )
    $net_login_url = add_query_arg(\'reauth\', \'1\', $net_login_url);

return $net_login_url;
}
add_filter(\'login_url\', \'ourcomments_network_login_url\', -100, 2);

这可以添加到主题函数中。php。或者加入一个插件（我还没来得及这么做）。

也许我应该补充一点，恶意用户仍然可以尝试以其他方式获取。这只是为了让普通用户更舒适。