Very true. When I joined them earlier this year I didn't provide my SSN and was set up as a buyer but still permitted to upload and sell photos. I guess when it gets time for a payout then I'll need to provide the info. There is another site in the US that I know of that not only requires your SSN but also a copy of you drivers license!
Tailspin, I have to agree it's a bite the bullet moment. Just think what can happen if their security is sloppy. When I first got set up with them they didn't require it but as my sale built up then they asked for it. This is the point I desided that if they're going to tax me like a business I would keep really good records and treat it like a business. I think it's the way most photo sites will go when government does an audit and wants to know if they really paid out any money.