Twitter Bot to track hashtag and add to list. Good for trolling Roy Moore Supporters

twitterList.js

var Twitter = require('twitter');

var client = new Twitter({
    consumer_key: 'x',
    consumer_secret: 'x',
    access_token_key: 'x',
    access_token_secret: 'x'
});
var list = "";
var params = { track: 'SearchKey' };
var stream = client.stream('statuses/filter', params);
addAllToList();
stream.on('data', function (event) {
    list += event['user']['screen_name'] + ",";
});

function addAllToList() {
    if (list.length > 0) {
        var addParams = {
            'slug': '',
            'screen_name': list.substring(0, list.length - 1),
            'owner_screen_name': ''

        };
        client.post('lists/members/create_all', addParams, function (error, response) {
            if (!error) {
                console.log("added " + addParams.screen_name + " to list");
                list = "";
            } else {
                console.log(error);
            }
        });
    }
    setTimeout(addAllToList, 7000);
}