I plugged my iPod 4.3.3 into my computer and went on iTunes and I pressed the update button and then it said that I don't have an internet connection even though I can go on Facebook and everything. I don't know if it's something with my computer or my iPod.
Just because you can get on facebook doesnt mean you have wi-fi. You could be runnung off of 3g. Wi-fi is three bars on top left of the screen next to your moible network company. If it says 3g then you dont have wi-fi.