What app is used on Facebook?

[DD]

Is it the 'Places' feature? Look it up, Facebook 'Places'. It's been around a while. It uses area location technology like many map apps do with portable devices. My iPod does it, with Wi-Fi. It also works on iPhones with 3G access. If you can connect to an access point, It'll give you a list of notable places (marks), such as a shopping centre or food outlet and you pick the one you're closest to. It's kind of like 'tagging on' to give your friends an idea of where you are and what you're up to... Also if you have A LIFE. So it may be Places.
Vote me best answer if this helped. Good day. ;D