Google's latest tinkering with its search results is causing concern among privacy advocates and online publishers while raising yet another set of antitrust concerns. The search giant is now providing what it calls "personalized" search, basically meaning it not only searches for keywords that match your search query but also shuffles through comments and postings made by your friends on blogs and social media sites, most particularly Google+. Aside from usability questions -- do you really care what your online "friends" are saying about trans fat's role in heart disease or do you want an expert opinion -- it raises concerns about whether comments made on Google+ will carry more weight than those made on other sites.

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