1. Instragram is only shown if you actually have Instagram installed on your device. ;-) As you might know, Instagram guard their API carefully: we don't yet have general access to it.

2. E-Mail is also only shown if your device has built-in e-mail accounts set up.

3. iTunes App File Sharing is accessible by connecting your device to your Mac/PC via USB and using the iTunes app.

Drop me a line jpap {at} snappylabs.com if you're still having issues. I'd love to help! :D