The idea of a ranking algorithm is that it produces "good results" -- returns the best, most relevant results based on the user's search terms. We have a notion that the traditional search engine algorithm is "neutral" -- that it lacks an editorial bias and simply works to fulfill some mathematical destiny, embodying some Platonic ideal of "relevance." Compare this to an "inorganic" paid search result of the sort that Altavista used to sell.
But ranking algorithms are editorial: they embody the biases, hopes, beliefs and hypotheses of the programmers who write and design them. What's more, a tiny handful of search engines effectively control the prominence and viability of the majority of the information in the world.
And those search engines use secret ranking systems to systematically and secretly block enormous swaths of information on the grounds that it is spam, malware, or using deceptive "optimization" techniques. The list of block-ees is never published, nor are the criteria for blocking. This is done in the name of security, on the grounds that spammers and malware hackers are slowed down by the secrecy.
But "security through obscurity" is widely discredited in information security circles. Obscurity stops dumb attackers from getting through, but it lets the smart attackers clobber you because the smart defenders can't see how your system works and point out its flaws.
Seen in this light, it's positively bizarre: a few companies' secret editorial criteria are used to control what information we see, and those companies defend their secrecy in the name of security-through-obscurity? Yikes!
The Wikia Search project has assembled the basic technologies for a search engine, including a search application, search algorithm and Web crawler. The project will allow technology enthusiasts to help filter sites and rank search results, using a community model akin to that of Wikipedia.Link (via /.)
The idea is to challenge the established players by offering a search service that is more transparent to end users, meaning they can see how search results are arrived at. Wales has described Yahoo and Google as opaque services that don't explain how results are arrived at.
(Disclosure: Jimmy Wales and I are writing a book together about a related subject)