#45 The Revelation was published in 2000. On page 21 of that book:
Where would "they" be waiting? His computer screen was still up — no screen-saver. At the bottom was a minimized "window," the words Yahoo! Maps written inside. I grabbed the mouse and clicked. Bingo— 1366 Fairmont and a road map in case I planned to drive. I didn't.
However, according to Yahoo! themselves and Wikipedia, "Yahoo! Maps" was only launched in 2002.
How could Marco's dad use "Yahoo! Maps" in 2000?
And more interestingly, how could K.A. Applegate (or actually, probably ghostwriter Ellen Geroux) write about "Yahoo! Maps" in 2000?