Get a lat long from a tweet, by first checking twitter geotags, then foursquare links

tweetgeocode.js

var d = document,
    w = window,
    k = d.getSelection,
    x = d.selection,
    ws = w.getSelection,
    s = (ws ? ws() : (k) ? k() : (x ? x.createRange().text : 0)),
    l = d.location,
    e = encodeURIComponent;

var tweetId = /\d+$/.exec(l)[0];
var tweetAPIUrl = "https://api.twitter.com/1/statuses/show.json?id=" + tweetId + "&callback=tweetData";

var tweetText;

jsonP(tweetAPIUrl);

function jsonP(url) {
    var script = document.createElement('script');
    script.setAttribute('src', url);
    document.getElementsByTagName('head')[0].appendChild(script);
}

function tweetData(data) {
    tweetText = data.text;
    if (data.geo) {
        latlong(data.geo.coordinates[0], data.geo.coordinates[1]);
    } else {
        var foursquareMatches = /http:\/\/4sq.com\/[^\s]+/.exec(data.text);
        if (foursquareMatches) {
            var yqlUrl = "http://query.yahooapis.com/v1/public/yql?q=select * from html where url=\"" + foursquareMatches[0] + "\"&format=json&diagnostics=true&callback=yqlData";
            jsonP(yqlUrl);
        }
    }
}
function yqlData(data) {
    var venueId = /\d+$/.exec(data.query.diagnostics.redirect.content)[0];
    var venueAPIUrl = "http://api.foursquare.com/v1/venue.json?vid=" + venueId;
    var veneYqlUrl = "http://query.yahooapis.com/v1/public/yql?q=select * from json where url=\"" + venueAPIUrl + "\"&format=json&callback=foursquareData";
    jsonP(veneYqlUrl);
}

function foursquareData(data) {
    latlong(data.query.results.venue.geolat, data.query.results.venue.geolong);
}

function latlong(lat, lon) {
    // do something with the coords
}