A whole, new vocabulary.
"So if you go to your page you'll see all of your stuff, and if you go to 'home' you'll see everyone else's stuff."
"'Home' is like a summary of everything that's happening."
"'Home' is your 'timeline.'"
"No, home is not your 'timeline.' 'Home' is your 'newsfeed.'"
"Okay, so why am I seeing large breasts right here."
"That's an advertisement."
How to explain Facebook to your father-in-law.