[joshuamerrill]

The first person who responded to the post works at Facebook and is a friend of Zuckerberg's, therefore, it would have appeared on his News Ticker.

Mark Zuckerberg is mentioned far, far too many times on Facebook every day to track each reply.

[JereCoh]

Correct. I am friends with Kelly, who works at Facebook and is friends with Mark. She replied. Her activity on my status update would have made it appear in his newsfeed.

[joshuamerrill]

Still, the "Zuck sees all" explanation is far more colorful. :-)