gistfile1.txt

// ==UserScript==
// @name         Facebook Mass Group Invite
// @namespace    http://tampermonkey.net/
// @homepage     http://cyberpunks.co.uk/facebook-mass-invite-tampermonkey.html
// @version      1.0
// @description  Scrapes targeted ID's from a Facebook group members page, or group discussion, and invite them to your own group.
// @author       James Jeffery
// @match        https://www.facebook.com/*
// @grant        none
// @require      https://code.jquery.com/jquery-3.0.0.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.13.1/lodash.js
// ==/UserScript==

// Gets all UID's from a page
var getUIDs = function() {
    var users = $('a[data-hovercard^="/ajax/hovercard/hovercard.php?id"], a[data-hovercard^="/ajax/hovercard/user.php?id"]').filter(function(i, el) {
        return $(el).text() !== '';
    }).map(function(i, el) {
        return $(el).attr('data-hovercard').match(/id=(\d+)/)[1];
    });

    return _.uniqBy(users);
};

//Invites users to a group
var inviteUsersToGroup = function(dtsg, gid, uids, uid) {
    var http = new XMLHttpRequest();
    var url = '/ajax/groups/members/add_post.php?source=dialog_typeahead&group_id=' + gid + '&refresh=1&dpr=1';
    var members = _.map(uids, function(el, i) { return 'members[' + i + ']=' + el; });
    var params = 'fb_dtsg=' + dtsg + '&' + members.join('&') + '&__user=' + uid;

    http.open("POST", url, true);
    http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    http.onreadystatechange = function() {
        if(http.readyState == 4 && http.status == 200) {
            return true;
        }
    };

    http.send(params);
};


(function() {
    'use strict';

    var dtsg = document.documentElement.innerHTML.match(/"token":"([A-Za-z0-9-_]+:[A-Za-z0-9-_]+)"/)[1];
    var uid = document.querySelector('[id^="profile_pic_header"]').getAttribute('id').split('_')[3];

    var users = [];

    // Menu to hold input and buttons
    var menu = $("<div></div>").css({
        'background': '#FFF',
        'position': 'fixed',
        'top': '40px',
        'right': '0',
        'margin': '10px',
        'padding': '20px',
        'zindex': '100'
    });

    // Group ID input field
    var groupIDInput = $('<input type="text" placeholder="Your Group ID" id="gid" />').css({
        'margin-bottom': '10px',
        'padding': '5px',
        'font-size': '14px'
    });

    // Scrape members button + onclick event handler
    var scrapeMembers = $("<button>Scrape Users</button>").css({
        'font-size': '16px',
        'display': 'block',
        'width': '100%',
        'padding': '10px',
        'margin-bottom': '10px'
    }).click(function() {
        var uids = getUIDs();

        uids.map(function(id) {
            users.push(id);
        });

        $('#userCount').text(users.length + ' Users Scraped');
    });

    // Invite to group button + onclick event handler
    var inviteToGroup = $("<button>Invite to Group</button>").css({
        'font-size': '16px',
        'display': 'block',
        'width': '100%',
        'padding': '10px',
        'margin-bottom': '10px'
    }).click(function() {
        var gid = $('#gid').val();
        if(users.length === 0) {
            alert('Scrape some users first!');
        } else if(gid === '') {
            alert('Enter a group ID!');
        } else {
            _.chunk(users, 10).map(function(ids) { 
                inviteUsersToGroup(dtsg, gid, ids, uid); 
            });
            users = [];
            alert('All members have been invited!');
        }
    });

    // Resset button + onclick event handler
    var resetButton = $("<button>Reset</button>").css({
        'font-size': '12px',
        'display': 'block',
        'width': '100%',
        'padding': '3px',
        'margin-bottom': '10px'
    }).click(function() {
        users = [];
        $('#userCount').text('0 Users Scraped');
    });

    menu.append(groupIDInput);
    menu.append(scrapeMembers);
    menu.append(inviteToGroup);
    menu.append(resetButton);

    menu.append('<p id="userCount">0 Users Scraped</p>').css({
        'text-align': 'center',
        'font-size': '14px'
    });

    $('body').append(menu);
})();