Google have been guilty of being incredibly secretive about how they rank websites in the past.
The method they use to rank websites—or their ‘algorithm’—has been a closely guarded secret, precisely to discourage webmasters and site owners trying to reverse engineer the algorithm for their own gain.
Over the last few years though, the company have been far more open about their methods, largely led by Matt Cutts (the head of Google’s Webspam and search quality team).
In the continuing spirit of openness, here are details of Google’s 10 recent algorithm changes. Recommended reading for webmasters.