I went to coinbase.com to withdraw using my debit card from my bank. A link to one of their web sites with "ssn" in the web address appeared and it said I had to answer some questions. Now I'm not going to give a bitcoin web site my social security number.

Luckily, it just asked how I spent my bitcoin. I chose the "investment" option like I always do. No social security number was asked for. I don't know why that appeared in the web address but if anyone else were to see that, go ahead and click and answer the questions.

On a related note, I've used the instant withdraw option at coinbase.com a few times for $250 each using my debit card and now my limits are $1,000 per withdrawal.