Click Personal Profile after login to opt out. The point here is to relate these examples to how your Website collects and uses the information from its visitors.
People are reasonable.
Build the case for why it benefits them to give information. Tell them what customized features your site can offer if they allow you to serve them. If your site utilizes cookies to manage sessions, give a link for interested visitors to see the code that places the cookie on their hard drive with sample data. People do care about what you put on their drive. What may appear innocuous to you and your technical staff is many times a mystery to Web visitors.