Twitter and the 87-Year-Old

Just one question.

How would you explain Twitter to an 87-year-old who has never used a computer? (Comments welcome!)

Free Writers' Resource Update

Roseli A. Bakar June 12, 2009 at 11:01 pm: It’s a tool grandparents use to send Christmas messages…
P. Kaiser June 13, 2009 at 6:45 am: It’s the new way of sending a postcard to let people know what you are doing. It’s like sending a postcard when you are in a big hurry so you only write a little bit i.e., “I didn’t arrive until Thursday because the weather was bad and the train was delayed.”
Ruri@Free article directory August 12, 2009 at 4:37 pm: First thing first, explain how to use computer and browser like firefox. Then give a reason why they need twitter.