The next development in the birth of the Internet was the so called 'selected third parties' syndrome. Where you signed up for a web site and that web site would sell your details to a few other businesses. This usually meant that your email inbox would become a target for several other businesses who inturn may have sold on your details to yet more 'selected third parties. And so on.
Back in those days giving out ones details was not considered such a problem though, as most users still trusted just about every commercial web site in existence at that time.
By the time the WWW part of the Internet had reached some level of maturity, however, this bond of trust was slowly eroding, especially amongst those who had been there from the start. As an example, consider Billy Nomates, he was there from the start and would glibly hand over his personal information to any web site that demanded it as he wanted the full Internet experience. Slowly over time he began reading some of the 'contracts' and to his slowly dawning horror he began to realise that he was being subjected to what amounted to a gang bang. Suddenly he was getting 'informational' emails from companies he had never heard of. His email count went from 4 or 5 a day, not counting spam, to 14-15. He realised that these companies, and worse his government, was selling his private information to other companies.
Just prior to the birth of Web 2.0 he made the conscious decision that if a web site demanded he filled in a form for access then he would do so. But if a web site further demanded he fill out forms about his interests he would go no further with the registration and would demand that the company remove his other details. He wasn't naive enough to think they would actually do this but he always demanded such anyway.
Do you glibly sign away your rights to privacy if a web sites demands you do so for access? Or do you do it carefully and only for selected web sites? Do you ever read the T&C's, FAQ etc?