Diversity is power on the Web. Big sites may be bigger, but smaller sites will keep scoring higher for specialized topics, both in terms of their connections with users and in terms of each visit's commercial value.
Jakob NielsenMinimize the user's memory load by making objects, actions, and options visible. The user should not have to remember information from one part of the dialogue to another. Instructions for use of the system should be visible or easily retrievable whenever appropriate.
Jakob NielsenPopularity is the product of two factors: (a) how compelling material you offer, and (b) how easy it is to access it. Host free pirated movies and users will flock to the site, even if it's difficult to use.
Jakob Nielsen