JQMTwitter - Twitter Search API call

twitter.js

// create our namespace
var RocknCoder = RocknCoder || {};

// this is the object that takes care of all of our twitter business
RocknCoder.Tweet = function () {
  var searchTerm = "",
    $appendTo,
    tmpl = "",
    numTweets = 10,

  init = function() {
    $appendTo = $("#tweets");
    tmpl = $("#tweet-template").html();
  },
  // load data from twitter
  load = function(search) {
    searchTerm = search || searchTerm;
    $.ajax({
      url: 'http://search.twitter.com/search.json?q='+searchTerm,
      type: 'GET',
      dataType: 'jsonp',
      success: function(data, textStatus, xhr) {
        var i, tweet, compiled;
        // clear all old tweets but not the search row
        $appendTo.find(".tweet").remove();
        // then redraw
        for (i = 0; i < data.results.length; i++) {
          tweet = data.results[i];
          tweet.timeAgo = timeAgo(tweet.created_at);
          compiled = _.template(tmpl, tweet);
          $appendTo.append(compiled);
          $appendTo.listview("refresh");
        }
      },
      error: function(jqXHR, textStatus, errorThrown){
        alert("error: "+errorThrown);
      }
    });
    // check again in 3 minutes
    setTimeout(RocknCoder.Tweet.load, 3*60*1000);
  },
  // format the time returned by Twitter
  timeAgo = function(dateString) {
    var rightNow = new Date(),
      then = new Date(dateString),
      diff = rightNow - then,
      second = 1000,
      minute = second * 60,
      hour = minute * 60,
      day = hour * 24,
      week = day * 7;

    // return blank string if unknown
    if (isNaN(diff) || diff < 0) {
      return "";
    }

    // within 2 seconds
    if (diff < second * 2) {
      return "right now";
    }

    if (diff < minute) {
      return Math.floor(diff / second) + " seconds ago";
    }

    if (diff < minute * 2) {
      return "about 1 minute ago";
    }

    if (diff < hour) {
      return Math.floor(diff / minute) + " minutes ago";
    }

    if (diff < hour * 2) {
      return "about 1 hour ago";
    }

    if (diff < day) {
      return  Math.floor(diff / hour) + " hours ago";
    }

    if (diff > day && diff < day * 2) {
      return "yesterday";
    }

    if (diff < day * 365) {
      return Math.floor(diff / day) + " days ago";
    }
    else {
      return "over a year ago";
    }
  };
  // only one function is visible, the load function
  return {
    load: load,
    init: init
  };
}();