Here's how you can download the Facebook Messenger app free for your iPad, iPhone, iPad mini or iPod Touch.
1. Go to the Facebook Messenger app preview page in iTunes (or tap the link on your iOS device to install the app directly).
2. Click the View in iTunes button.
3. Click the Free button to download the app.
4. Sync your iPad, iPhone, iPod Touch or iPad mini with iTunes to install the app.
Here's a description and screenshot:
"Text your friends for free. Get Facebook Messenger to instantly reach friends on their smart phones, feature phones or desktop computers. In addition to sending free texts, you can also:
- Chat with a group
- Send voice messages, photos, smileys and other emoji
- Get push notifications
- Know who’s seen your messages
- Include your location
Messenger does all this using your existing data plan."