No, it does not cost money to look up apps on an iPod touch.
No it does not cost to restore the ipod. You can easily restore it using itunes on your computer.
No.
Tumblr for iPod Touch is free and no it doesn't cost any money to post stuff on Tumblr from your iPod. I have Tumblr for my iPod Touch and I LOVE it. I'm not too sure if it costs anything to post from an iPhone,but I don't believe it does. Hope this helped(:
Colin
No if you have unlimited
Yes facebook mobile costs money, when you send a message to set your status it costs money but notifacations sent to your phone dont cost a thing. So yes it does cost money.
yes
The iPod Touch 8gb costs 199$
over $60
on itunes it does
No it dose not