The Bay Area is quite the high-tech business mecca, no question about that. There's a constant churn of business booms and busts. With the Facebook IPO, I don't believe it will have as much an affect as is sensationalized in the news media.
It seems like it would have a more profound impact on higher end properties, such as those in peninsula neighborhoods like Atherton, Palo Alto and Menlo Park or in the Mission Hills in Fremont.
That being said, I think you answered your own question. The proximity of Ardenwood to the Facebook HQ is pretty darn close, and will have an effect. How much so, remains to be seen!
Remember, a million dollars is not what it used to be! ;)