A social approach is the solution, but it MUST be designed so that it may not be gamed. The best way to do that is to allow me to vote up or down the search results and to allow me to blacklist/whitelist sites and to OPTIONALLY include my friends black and white lists. It is this component of including friends, i.e. people I already trust, that ensures that it won't be gamed. If a friend of mine tries to game me, he/she won't be my friend for long. So it's self-policing.