Om Googles sökalgoritmer
I senaste numret av Wired (landade i min brevlåda igår) finns en mycket intressant artikel om Googles sökalgoritmer skriven av en av mina stora förebilder, Steven Levy:
Throughout its history, Google has devised ways of adding more signals, all without disrupting its users’ core experience. Every couple of years there’s a major change in the system — sort of equivalent to a new version of Windows — that’s a big deal in Mountain View but not discussed publicly. “Our job is to basically change the engines on a plane that is flying at 1,000 kilometers an hour, 30,000 feet above Earth,” Singhal says. In 2001, to accommodate the rapid growth of the Web, Singhal essentially revised Page and Brin’s original algorithm completely, enabling the system to incorporate new signals quickly. (One of the first signals on the new system distinguished between commercial and noncommercial pages, providing better results for searchers who want to shop.) That same year, an engineer named Krishna Bharat, figuring that links from recognized authorities should carry more weight, devised a powerful signal that confers extra credibility to references from experts’ sites. (It would become Google’s first patent.) The most recent major change, codenamed Caffeine, revamped the entire indexing system to make it even easier for engineers to add signals.