On September 1st, Facebook sent a message to all of its users
saying that all registered users as of September 5th will be
entered into a contest, to be selected at random, to win an
all-expense-paid two-week vacation to Fiji. Teresa is a registered
Facebook user-- she received and read the message. A week later,
Facebook notified Teresa that she won the trip. That night, Teresa
celebrated her good fortune by buying ten of her friends a round of
drinks...