I read Harold's meaning that technology becomes invisible in the sense of being taken for granted. Stewart Brand years ago predicted that computers were about to disappear from view the way motors had. "No one called the automobile...a personal railroad, but that's what it was....then motors got smaller and disappeared into...toothbrushes, wristwatches..."

I think most people assume now that other people have email and mobile phones. If like me someone has a land line, he'll say, "This is my cell phone," otherwise not. It's just how you call him.

Facebook and similar tools are still pretty new to many people, but I'm sure the St. John parent or one of her allies readily helps the newcomer put Facebook to use. "All you do is sign up, create an idea, and then..."

In fact, I think that's how this sort of tool moves into the midrange of the bell curve: people have a specific need/problem/opportunity ("keep the language immersion) and get the tool for that specific purpose. Success breeds confidence breeds extension to other realms in a person's life.