If there are bloggers covering the private company you are researching, they can be very useful to help with your private company research. Bloggers can cover subjects in great detail and often attract motivated audiences to build strong communities of interest around the subject. If that subject is a private company, the blogger and members of the blogger's virtual community can provide some big help with your private company research. It's not 100 percent accurate, but at the same time it's a great source for early news. If there's a blogger covering your business or industry, check in and gauge the blogger's usefulness to your private company research.