old_contents: 
  /**
   * Module dependencies.
   */
  
  var request = require('./util/request');
  var debug = require('debug')('wpcom:follow');
  
  /**
   * Follow 
   *
   * @param {String} site_id - site id
   * @param {WPCOM} wpcom
   * @api public
   */
  
  function Follow(site_id, wpcom) {
    if (!site_id) {
      throw new Error('`site id` is not correctly defined');
    }
  
    if (!(this instanceof Follow)) {
      return new Follow(site_id, wpcom);
    }
  
    this.wpcom = wpcom;
    this._sid = site_id;
  }
  
  /**
   * Follow the site
   *
   * @param {Object} [query]
   * @param {Function} fn
   */
  
  Follow.prototype.follow =
  Follow.prototype.add = function (query, fn) {
    var path = '/sites/' + this._sid + '/follows/new';
    return this.wpcom.req.put(path, query, null, fn);
  };
  
  /**
   * Unfollow the site
   *
   * @param {Object} [query]
   * @param {Function} fn
   */
  
  Follow.prototype.unfollow =
  Follow.prototype.del = function (query, fn) {
    var path = '/sites/' + this._sid + '/follows/mine/delete';
    return this.wpcom.req.del(path, query, null, fn);
  };
  
  /**
   * Get the follow status for current 
   * user on current blog sites
   *
   * @param {Object} [query]
   * @param {Function} fn
   */
  
  Follow.prototype.state =
  Follow.prototype.mine = function (query, fn) {
    var path = '/sites/' + this._sid + '/follows/mine';
    return this.wpcom.req.get(path, query, fn);
  };
  
  /**
   * Expose `Follow` module
   */
  
  module.exports = Follow;
new_contents: 
  /**
   * Module dependencies.
   */
  
  var request = require('./util/request');
  var debug = require('debug')('wpcom:follow');
  
  /**
   * Follow 
   *
   * @param {String} site_id - site id
   * @param {WPCOM} wpcom
   * @api public
   */
  
  function Follow(site_id, wpcom) {
    if (!site_id) {
      throw new Error('`site id` is not correctly defined');
    }
  
    if (!(this instanceof Follow)) {
      return new Follow(site_id, wpcom);
    }
  
    this.wpcom = wpcom;
    this._sid = site_id;
  }
  
  /**
   * Get the follow status for current 
   * user on current blog sites
   *
   * @param {Object} [query]
   * @param {Function} fn
   */
  
  Follow.prototype.state =
  Follow.prototype.mine = function (query, fn) {
    var path = '/sites/' + this._sid + '/follows/mine';
    return this.wpcom.req.get(path, query, fn);
  };
  
  /**
   * Follow the site
   *
   * @param {Object} [query]
   * @param {Function} fn
   */
  
  Follow.prototype.follow =
  Follow.prototype.add = function (query, fn) {
    var path = '/sites/' + this._sid + '/follows/new';
    return this.wpcom.req.put(path, query, null, fn);
  };
  
  /**
   * Unfollow the site
   *
   * @param {Object} [query]
   * @param {Function} fn
   */
  
  Follow.prototype.unfollow =
  Follow.prototype.del = function (query, fn) {
    var path = '/sites/' + this._sid + '/follows/mine/delete';
    return this.wpcom.req.del(path, query, null, fn);
  };
  
  /**
   * Expose `Follow` module
   */
  
  module.exports = Follow;
subject: tidy code