Google Latitude (in Almost all smartphones)

With Latitude, you don’t technically join a social network. Instead you build your own private social network from the ground up, based on the friends you have who are also running Latitude and keep it active on their phone. As you can see, my friend Jorge runs Latitude fairly often – his last updated location was January 14th. My buddy Mark chickened out back in May of last year and hasn’t updated his location since!

By the way, while there’s no Latitude “social network” per se, there is the option to add your “Latitude Badge” to your favorite social network or blog and share out your GPS location to the entire world (if you dare).

LOCiMOBILE [iPhone & Android]

LOCiMOBILE has a few great GPS tracking apps out at the moment. The two that I would like to feature are the free/lite versions of the software.This app supports up to 6 users (paid version is unlimited) and integrates with Twitter and Facebook.

iLOCi2 Lite

iLOCi2 is the “Interactive GPS People Finder.” Add people to your contact list and you can receive their location through notification alerts.

Mobcast [iPhone & Web Browser]

Mobcast is a Facebook application that lets you meet up with your friends without calling back and forth. View your friends’ locations on a map and post “mobcasts” which update your Facebook status with your location and push notifications to your friends.

Since the app is integrated with Facebook, there is no need to add your friends. You can also use this application from any web browser simply by signing in.

FindMyFriend

Find My Friend is a Facebook app, which means it cannot be used if you don’t have a Facebook account. The main purpose of the app is to be able to meet up with your friends without having to tell each other where you are. It is integrated with Facebook and you have the ability to accept/reject requests. Privacy is taken into account with this app.

Glympse.

Using the service is very simple. Instead of constantly sharing out your location publicly, you can instead send out a public glimpse of your location when you want to share it. You can send the update to your friends via SMS or email or (and this is my favorite feature) you can send it to Twitter.