If you are looking forward to create a website your first step begins here. You must create a website that is useful to general public.In order to understand the history of people and their preferences we must conduct a study on what is the most searched topic on the Internet. Hot topics do change periodically. There are websites that gives you this precious information for free. Websites like stumbleupon.com helps you learn more about the trends on internet. There are many more social networking sites like Digg.com would share this precious information for free.
Once you have selected on the topic which is preferred you can conduct your searches using favorite search engines like google.com,Yahoo.com and bing.com. We would suggest you to visit http://freekeywords.wordtracker.com to learn more about how many searches are conducted per keyword.
Search engines do release a list of most searched topic on the internet periodically. This could help you understand the trend of internet. But remember popular keywords and hot topics are targeted by many and the competition would be high here. We would suggest you to choose the middle path while selecting the topic for your website.