This app uses GPS, geo-targetted local notifications. The GPS runs in the background in order to identify the users' location in order to send out specific notifications. Users can choose to disable this at the time the app is being installed without it affecting the general usage of the app.
Continued use of GPS running in the background can dramatically decrease battery life. Facebook doesn't run GPS in the background unless you give us permission by turning on optional features that require this.
Note: This app may use large amounts of data, and carrier data charges may apply. For best results, we recommend you connect your device to trusted Wi-Fi networks when available.