Does Social Messaging Displace Text Messaging?

The data is impressionistic, but one user has discovered that ability to send Apple iOS 5 "iMessages" does reduce the amount of text messaging.

Apple's iMessage is a service that seeks to replace text messaging, and in at least this case, seems to do precisely that.

The iMessage service sends messages (text, images or video) using any broadband access mechanism, defaulting to text messaging if the recipient cannot receive such messages. It probably is important to note that the biggest potential effects would be seen where one iOS 5 user sends lots of messages to other iOS 5 users.

 What iMessage cuts text messaging