I have just read the following which can be very serious if you do not take care :

When visiting unknown websites, be vigilant about protecting your identity. Remember that some information is automatically made visible to the site. Information such as the computer’s IP address, domain name (e.g., .com, .gov, or .edu), software details, and page visit information is often saved in cookies. to read the full details go to :  /http://www.cisecurity.org/daily-tip/know-what-information-is-being-collected/