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Chakkravarthi Raghavan
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Blog Post: How Personalized Search Changes SEO (and Doesn't)
yes but Google rankings will not be influenced by the.. traffic you buy that's the whole point :)

Hmm I have personally disagree on couple of points most people mention when it came to personal search which Google announced which is already in motion.

One is rich even get richer thing which you have mentioned in this article too, Its not just you make a single click on particular search term it will automatically get the page you clicked to the top next time you make the search for the same query next time. you might notice the results will still be based on other ranking factors in Google algorithm. Unless otherwise you want to check out the same page again and again more than a dozen times, which is a rare case in my opinion, so new sites still got some room to show up on people's search results and people who really influence your sites are unique visitors and a person when he finds the information what he is looking for the first time is less likely to look for the same over dozen of times or on the other hand if he is obsessed with the site he looked for he will most likely to bookmark the site or go directly to it which again is less probable. 

Buying traffic: 

I don't think buying traffic will be of much help if provided Google uses signals from all sources of data as we want to assume here, its higly likely that your bouce rates would be high when you buy traffic and according to ERR metrics bouce rates are considered bad for a site rankings and not only that, where will Google be able to influence its rankings? it needs the keyword which user has to type in to look for a page and then it looks in to bounce rates of each search results on the whole and re-arranges search results accordingly for that perticular term. But when you buy traffic, visitors are not coming from Google and its highly likely that ads or whatever information you gave for your ads to buy traffic may not possibly relate to Google datas meaning your page might not actually show up for the term you have used in your ads to buy traffic. So it makes no sense. 

Sorry I am not being offensive but these are just my thoughts, I really don't think this whole speculation over personalized search results and all those things going to influence your SERPS in a major way like its assumed in my opinion.