It may be very difficult to boycott Google entirely, though using alternative search methods like Startpage.com is, well, a start.
Every time I find myself using google, especially if I notice a particularly biased news piece, I will enter the search term "Google lies" into their own search engine. Because Google catalogues the search terms using on their site, it serves as a nice reminder that we know what they are doing.
If you are not familiar with the censorship and manipulation that Google engages in, below you will find just one of many news articles that provide detail.
Yes, Google is a private company that should be free to provide any kind of search results they want. The idea that Google is completely free to do whatever it wants in a world where one bureaucratic ruling can mean the difference between profitability and failure is not fully realistic. And we have a responsibility to build alternative systems to Google in response. But I am also free to remind Google that I know it lies and wants to lie.