Unless your consumer transactions are all consummated with cash, your name and what you buy are recorded in a database somewhere. Unless you're paid under the table, your place of employment and your income are noted by the IRS. Those who drive have license, registration and insurance information out there. Those who visit a doctor have medical records out there. Campaign contributions can be looked up. Real estate transactions and whether property taxes are paid on time are a matter of public record.
Against this backdrop, allowing Facebook to import one's address book so people in it can be suggested as prospective Facebook friends doesn't seem an alarmingly unwise choice.
Everybody is somewhat vulnerable to
digging, but opening up your address book to Facebook
voluntarily exposes you to not only those to whom you choose to be exposed, but to those from whom you'd prefer to be hidden.
As the old saw goes, though, you pay your money, you make your choices, and you take your chances.
I'll stand by my
My impression is that many (most?) people who join Facebook are both looking to be found and to find others and are happy that Facebook can accommodate them...without getting to deeply into the means.
