Run this script from console (or package as a bookmarklet) to export comments into a new window, suitable for inserting into a Google Doc

bookmarklet.js

javascript: (function(){ var script = document.createElement('script'); script.src = "https://raw.github.com/gist/3224206/facebook-comment-exporter.js"; document.body.appendChild(script); }())

facebook-comment-exporter.js

(function(){
    "use strict";

    var comment_export_win = window.open('about:blank');

    [].forEach.call(document.querySelectorAll('.text_exposed_link a'), function (el) {
        el.onclick();
    });

    [].forEach.call(document.querySelector('.uiCommentContainer').querySelectorAll('.commentList > li'), function (li) {
        var comment_content = li.querySelector('.commentContent');

        var text_exposed_hides = comment_content.querySelectorAll('.text_exposed_hide');
        [].forEach.call(text_exposed_hides, function (text_exposed_hide) {
            text_exposed_hide.parentNode.removeChild(text_exposed_hide);
        });
        var text_exposed_show = comment_content.querySelector('.text_exposed_show');
        if (text_exposed_show) {
            while (text_exposed_show.firstChild) {
                text_exposed_show.parentNode.appendChild(text_exposed_show.firstChild);
            }
            text_exposed_show.parentNode.removeChild(text_exposed_show);
        }
        comment_content.normalize();

        var name = comment_content.querySelector('.actorName').textContent;
        var comment_body = comment_content.querySelector('.commentBody').cloneNode(true);

        var comment_permalink = li.querySelector('.commentActions > .uiLinkSubtle').cloneNode(true);
        comment_permalink.setAttribute('href', comment_permalink.href);
        comment_permalink.textContent = comment_permalink.querySelector('abbr').title;

        var p = document.createElement('p');
        p.appendChild(comment_permalink);
        comment_body.insertBefore(p, comment_body.firstChild);

        var name_el = document.createElement('h3');
        name_el.appendChild(document.createTextNode(name + ': '));
        comment_body.insertBefore(name_el, comment_body.firstChild);

        comment_export_win.document.body.appendChild(comment_export_win.document.importNode(comment_body, true));
        comment_export_win.document.body.appendChild(comment_export_win.document.createElement('hr'));
    });

}());