Hooked on Foursquare, the locative, social networking tool for mobile devices? Now, you can now track your friends from the relative comfort of your Mac desktop or laptop.

Folks use Foursquare (http://foursquare.com) to arrange lunch dates at their favorite joints. They can also unlock points and freebies, such as free cups of coffee, at some of these places.

The new application for Macs, FoursquareX (http://codebutler.github.com/foursquarex) uses the Snow Leopard operating system’s Core Location feature, to quickly notify you when your friends have “checked-in” at one of your favorite venues.

Core Location is based on the Wi-Fi locative software from Boston-based Skyhook Wireless Inc. (http://skyhookwireless.com)