One thing to take into account is that Jerry Yang and David Filo did their Yahoo directory in 1994 when there was a great need for search engines and people jus

One thing to take into account is that Jerry Yang and David Filo did their Yahoo directory in 1994 when there was a great need for search engines and people just didn't know what was out there. Their directory gave people a way of seeing what was there. They also have great timing. They did it in Jan. 1994, only a few months after the first few search engines. So lots of people not knowing about their other options and a great need for a 'directory' of the relatively unsearchable web made their company very popular.