facebookのlike boxを横幅100%で指定してレスポンシブデザインに対応。

gistfile1.css

.fbcomments,
.fb_iframe_widget,
.fb_iframe_widget[style],
.fb_iframe_widget iframe[style],
.fbcomments iframe[style],
.fb_iframe_widget span{
    width: 100%! important;
}


/* いいねボタンが着いてる場合は、以下のように絞ったほうがいいみたい */
.widget-container .fbcomments,
.widget-container .fb_iframe_widget,
.widget-container.fb_iframe_widget[style],
.widget-container .fb_iframe_widget iframe[style],
.widget-container .fbcomments iframe[style],
.widget-container .fb_iframe_widget span{
    width: 100%! important;
}