New submitter jgb writes "WebKit is, now that Opera decided to join the project, in the core of three of the five major web browsers: Apple's Safari, Google's Chromium and Opera. Therefore, WebKit is also a melting pot for many corporate interests, since several competing companies (not only Google and Apple, but also Samsung, RIM, Nokia, Intel and many others) are finding ways of collaborating in the project. All of this makes fascinating the study of how they are contributing to the project. Some weeks ago, a study showed how they were submitting contributions to the code base. Now another one uncovers how they are reviewing those submitted contributions. As expected, most of the reviews during the whole life of the project were done by Apple, with Google as a close second. But things have changed dramatically during the last few years. In 2012, Google is a clear first, reviewing about twice as much (50%) as Apple (25%). RIM (7%) and Nokia (5%) are also relevant reviewers. Code review is very important in WebKit's development process, with reviewers acting as a sort of gatekeepers, deciding which changes make sense, and when they are conforming to the project practices and quality standards. In some sense, review activity reflects the responsibility each company is taking on how WebKit evolves. In some sense, the evolution over time for this activity by the different companies tells the history of how they have been shaping the project."