More than you ever wanted to know about online accounts with Yahoo (or anybody else)

The Internet is a fantastic enabler and resource, but it also has aspect of a Middle Eastern bazaar: along with all kinds of fascinating shops and wares, there are thieves, grifters and crime rings.  To protect yourself, you have to strike a balance between closing your eyes and hyper-paranoia.  Here's some basic information about setting up an account with Yahoo....or anyplace else on the Internet.  If you don't want to know, that's OK and good luck with your online security/safety. This is my take on this matter.  People and computer people being what they are, some may pick at what I am going to say, but it is the result of 28 years as a computer professional.
So you can get a Yahoo ID and still prevent Yahoo from knowing anything more than your email address

More complicated stuff follows (but ignorance is no protection)