When your iPod won't connect to internet and the internet needs apps, you need to check that it is not a problem with your WIFI connection. Ensure also that your iPod is connecting to the right Wifi connection. Get more information from http://voices.yahoo.com/what-ipod-touch-wont-2746915.html.
It's probably your wifi connection. Like I have this crappy company called brighthouse and sometimes I have to wait a while for the Internet to work again. So call the company or wait patiently. Hope this helped c: