What the author is saying, as I understand it, is that Google needs a way to mix up their algo's so they aren't easily "gamed" by scammers and spammers.
The question is not whether Google is doing this actively but how fast and decisively they do this as well as what specific issue they deem as priority to address.
Google's algo, as I understand it, is an array of knobs that are turned up and down to increase or decrease impact of various factors such as domain age, incoming links, quality of content, etc. Google is always adjusting these knobs and adding/removing knobs. The goals of adjusting these knobs are obviously only known by Googlers but what is clear to many is that the sole object of adjusting these knobs in not to make the results pages more relevant. Don't get me wrong... they definitely care about relevancy (or they wouldn't have the trust of millions) but they are a public company with obligations to meet so they must take many factors into account when making adjustments.
The point? The sex (aka variation over time) that the author refers to will likely come from adjusting existing knobs and introducing new knobs such as social authority, locality, etc... but it doesn't necessarily mean that problems of relevance as we see it will get fixed through these variations. Google will take into account a number of factors when deciding what problems they want to solve and to what extend.
The question is not whether Google is doing this actively but how fast and decisively they do this as well as what specific issue they deem as priority to address.
Google's algo, as I understand it, is an array of knobs that are turned up and down to increase or decrease impact of various factors such as domain age, incoming links, quality of content, etc. Google is always adjusting these knobs and adding/removing knobs. The goals of adjusting these knobs are obviously only known by Googlers but what is clear to many is that the sole object of adjusting these knobs in not to make the results pages more relevant. Don't get me wrong... they definitely care about relevancy (or they wouldn't have the trust of millions) but they are a public company with obligations to meet so they must take many factors into account when making adjustments.
The point? The sex (aka variation over time) that the author refers to will likely come from adjusting existing knobs and introducing new knobs such as social authority, locality, etc... but it doesn't necessarily mean that problems of relevance as we see it will get fixed through these variations. Google will take into account a number of factors when deciding what problems they want to solve and to what extend.
</rambling>