Customer boycotts, protests and criticism from the media has Starbucks (SBUX) rethinking its tax practices in the United Kingdom, a published report said. Google (GOOG) and Amazon (AMZN) also have come under fire for taking advantage of tax loopholes, according to Reuters. The coffeehouse giant's U.K. division paid no corporation tax for the past three years and paid just $13.8 million in income tax (at today's exchange rates) since 1998. During