- Blogs/Contributed Content: You may explain what kind of content you allow on your blog or forum. This will allow you to moderate content without running into trouble with your third party contributors.
- Collecting E-Mail Addresses (Newsletters): This is probably the most important reason. If you have any kind of contact box on your site which requires an email input (chances are you do), then your customers will want to know what you will be doing with their emails and how their private information will be collected, stored and used. (See the TD Labs privacy statement as an example)