Use FaceTime to make video or audio calls to other iOS devices or computers that support FaceTime. The front-facing FaceTime camera lets you talk face-to-face; switch to the rear-facing iPod touch camera to share what you see around you.
Note: FaceTime may not be available in all areas.

With a Wi-Fi connection and an Apple ID, you can make and receive FaceTime calls (first sign in using your Apple ID, or create a new account).
Set up FaceTime. Make sure FaceTime is turned on in Settings > FaceTime. You can also specify a phone number, Apple ID, or email address to use with FaceTime and set your caller ID.
Make a FaceTime call. Tap FaceTime, then type the name or number you want to call in the entry field at the top. Tap
to make a video call, or tap
to make a FaceTime audio call. Or tap
to open Contacts and start your call from there.
Leave a message. If no one answers your call, tap Leave a Message. You can also choose to cancel the call or try calling back.
Want to call again? Tap FaceTime to see your call history on the screen. Tap Audio or Video to refine your search, then tap a name or number to call again. Tap
to open the name or number in Contacts.
Delete a call from call history. Tap FaceTime to see your call history on the screen. Swipe to the left, then tap Delete to delete the name or number from your call history.
Can’t take a call right now? When a FaceTime call comes in, you can answer, decline, or choose another option.
Ask Siri. Say something like: “Make a FaceTime call.”

See the whole gang. Rotate iPod touch to use FaceTime in landscape orientation. To avoid unwanted orientation changes, lock iPod touch in portrait orientation. See Change the screen orientation.