What are the odds?

Every time I fly to Minnesota from, well, anywhere, I kind of expect to recognize someone on my flight. This feeling isn't as strong anymore as I know what seems like fewer and fewer people in my hometown. As further evidence, this past weekend on the way to our local Target, my mom asked if I expected to run into someone I knew at Target... um, who would that be?
However, the past two times I've flown (aside from Israel, which is an outlier) I've either seen or been SEATED NEXT TO someone I know. Once was just in the airport, the other was on a flight back to NY from Oakland in January. What are the odds? Well, I did a few calculations:
In 2005 100 Million people pass through the NY airports, JFK, Newark, Laguardia.
I have 122 Friendsters. Say I also know the parents and on average one sibling of a quarter of them... there's another 91.5 people. Then theres the people I would recognize, I know but don't "know" and so am not connected to via online social networking at all. Say, an equal number to friendsters and familes- another 213.5 people. And then the people who aren't on Friendster. Let's optimistically say I know 600 people. Or would recognize them. This means that everyone I know is .0006% of the people who pass through the NY airports, and that's assuming they ALL flew in and out of NY and I was at the airport (all 3) all day every day to see them. Kind of astonishing to recognize anyone at all, actually. Food for thought. Next topic will be: After beating incredible odds like these... why do I still try to avoid saying hello? Discuss.