Notes

var placeId = 303575023; // Place to check and message
var waitTime = 5; // In seconds
var group = 0; // 0 for no group check, otherwise people in this group will not receive the message
function sendMsg(userId, username) {
function send() {
$.post("http://www.roblox.com/messages/send",{
subject: 'wassup m8',
body: 'Hello ' + username + '! I see you like Phantom Forces! WELL WHO CAES, TRADE THIS GUY http://www.roblox.com/users/19844667/profile',
recipientid: userId,
cacheBuster: new Date().getTime()
}).done(function(response) {
if (response.success == true) {
console.log('Sent message to ' + username + ' (' + userId + ')');
} else {
console.log('Error sending to ' + username + ': ' + response.shortMessage);
}
});
}
if (group > 0) {
$.get("http://www.roblox.com/Game/LuaWebService/HandleSocialRequest.ashx?method=IsInGroup&playerid=" + userId + "&groupid=" + group, function(response) {
if(response.indexOf('true') == -1) {
send();
} else {
console.log('Didn't send a message to ' + username + ' because he is already in group ' + group + '.');
}
});
} else {
send();
}
}

var i=0;
function run() {
var timeout = 0;
var url = "http://www.roblox.com/games/getgameinstancesjson?placeId=" + placeId +"&startindex=" + i*10;
$.get(url).done(function(obj){
for (var server in obj.Collection) {
for (var players in obj.Collection[server].CurrentPlayers) {
var plr = obj.Collection[server].CurrentPlayers[players];
if (plr.Id > 0) {
(function(time,id,name) {
setTimeout(sendMsg,time,id,name);
})(timeout,plr.Id,plr.Username);
timeout+=waitTime*1000;
}
}
}
i++;
setTimeout(run, timeout);
});
}
run();