StopLightz

This app will show you where the party is at. No one likes hitting on someone for an hour only to find out they are already involved with someone. The solution? Stoplightz! Let the color of the pins guide you to somewhere you KNOW the single scene is. Green means GO! Select your relationship status and it will show you all the happening party spots right then near you with the most of the type of people you are looking to meet or party with, without giving out your personal details such as name, gender, or age.

Based on the concept of a Stop Light Party which you can learn about at http://en.wikipedia.org/wiki/Stop_light_party

If you are in a relationship or involved with someone already you must show red. If you are currently not looking for anyone, or are involved but are open to other opportunities, you should show yellow. Finally, and most importantly, you should show green if you are single and are open to hooking-up.