A:AnswerConsidering you have 80g already, getting the 128 like I did would not leave you too much room before you would encounter the same issue. Logic says get the next size larger.
A:AnswerDepends on what else is installed (videos, pictures, and apps all use storage as well). Figure ~1MB/minute, over 1600hrs on the 128GB model, without anything else installed.
A:AnswerYes... these iPods are just like a iPhone, WITHOUT the phone part. It will NEED to be on a Wi-Fi network in order to access FB or any other streaming service because it does NOT have cellular service. So if your in the car and you have a cell phone that can act like a hot spot, you can turn it on and allow the iPod to join your hot spot network or it can join you home network.