I think you are oversimplifying "the idea". Google's idea wasn't that "people will want to search online." Google's insightful, interesting idea that was then well-executed was the PageRank algorithm.
Geocities, Myspace and Facebook were all very different ideas. If the first two had executed better, all 3 would probably still co-exist.
Geocities, Myspace and Facebook were all very different ideas. If the first two had executed better, all 3 would probably still co-exist.