I use services from MyId.com, it's a complete identity theft protection tool for me. With this I am able to control my privacy and visibility of personal information, it alerts me every time my privacy is on risk online.
Identity theft can lead to a person's financial secrets being leaked and the privacy of his communication can be compromised. Online scammers can steal credit card details, bank account details and passwords to crucial websites.
The relationship between Information Technology and privacy can be described as a complex one. While some people get their privacy needs met through information technology, other will have their privacy compromised and they become vulnerable to identity theft and other malicious activities.
Identity theft would be a primary concern why you would want to keep your Personal information private. There are other reasons also, like Spam or Cyberstalkers or lawsuits (think RIAA - they have sued 30,000 people). All in all Privacy is very important.