You probably aren't getting a slew of responses because your title and your objective don't seem to be realistic. There are many smart people / organizations who have created search engines and portals but there is still only one Google. Yahoo has been slipping relative to Google even though it had a head start. It's great to think big but if it isn't realistic, then it may just be delusional. Just because the internet is easier to get into at the low end than some other kinds of businesses doesn't mean that it is that much easier to become a big successful company. You might as well have said:

"I have a great new idea for a soft drink and this will be bigger than Coke or Pepsi"

or

"I have a great idea for a new automobile and this will kill Toyota and General Motors"

It isn't that any of these are impossible but they are improbable. Even someone with great business and communication skills (which you haven't demonstrated in your post) would have a hard time convincing the world that they had a realistic chance of achieving any one of them. Most big companies started small and built up over time. There probably aren't many cases of a new entrant being able to establish itself and then overcome very entrenched competition unless there is a change in technology or the market that gives it a serious edge.