TwitterSpy.js

// TwitterSpy.js
// npm install twitter
// npm install prompt
 
var requestCooldown = 5; // in seconds
 
var Twitter = require('Twitter');
var prompt = require('prompt');
 
// Provide your Twitter API keys in this object
var client = new Twitter({
    consumer_key: '',
    consumer_secret: '',
    access_token_key: '',
    access_token_secret: ''
});
 
function sleep(seconds) {
    var waitTill = new Date(new Date().getTime() + seconds * 1000);
    while (waitTill > new Date()) {}
}
 
function performSearch(u1, u2) {
    var u1followers = [ ];
    var u1followings = [ ];
    var u2id;
 
    console.log("Downloading u1's followers...");
    var followersHandling = function(error, followers, response) {
        if (error) throw error;
        u1followers = u1followers.concat(followers.ids);
        if (followers.next_cursor != 0) {
            sleep(requestCooldown);
            client.get("followers/ids", { screen_name: u1, cursor: followers.next_cursor }, followersHandling);
        } else {
           
            console.log("Downloading u1's followings...");
            var followingsHandling = function(error, followings, response) {
                if (error) throw error;
                u1followings = u1followings.concat(followings.ids);
                if (followings.next_cursor != 0) {
                    sleep(requestCooldown);
                    client.get("friends/ids", { screen_name: u1, cursor: followings.next_cursor }, followingsHandling);
                } else {
 
                    console.log("Resolving u2's id...");
                    client.get("users/show", { screen_name: u2 }, function(error, user, response) {
                        if (error) throw error;
                        u2id = user.id;
 
                        console.log("");
 
                        if (u1followings.findIndex(function(v, i, o) { return v == u2id }) != -1) {
                            console.log(u1 + " follows " + u2);
                        }
 
                        if (u1followers.findIndex(function(v, i, o) { return v == u2id }) != -1) {
                            console.log(u2 + " follows " + u1);
                        }
 
                    });
 
                }
            }
            client.get("friends/ids", { screen_name: u1 }, followingsHandling);
 
        }
    }
    client.get("followers/ids", { screen_name: u1 }, followersHandling);
}
 
console.log("The application will use userOne as a base.");
console.log("Please make sure userOne is not private.");
 
prompt.start();
 
prompt.get(['userOne', 'userTwo'], function (err, result) {
    performSearch(result.userOne, result.userTwo);
});