aw$me to see on posts nd comments "via ipad or ios"
Or, do you mean from Twitter or Facebook? If so, you log into either (or both) via the Settings app and turn on the "Share Widget" in Notifications (also in the Settings app).
Then, when you post to either by using the "Tap to Tweet" or "Tap to Post" buttons that you will find in your pull-down Notification Center - you, too, will have the "posted via iOS" phrase.
Marilyn