I mostly used mine to check in from time to time, but don't do a lot of posting from it as I'm usually at work or in meetings when I'm on it. I also think a lot depends on the device. My android's built in keyboard has voice recognition, so you could pretty much dictate the whole post. It does a good job and learns as you correct it.
Your iPod touch could have such a feature, but it's probably an add-on app that you'll need to purchase as well as a headset that has the mic built in. The headset is handy if you use skype or VOIP to make calls, can then do them from the iPod if you've got a wifi connection.
To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word boo. Robert Brault