What’s the first thing you think of when you read the words “web search”? According to market share data, nine out of ten of you would say “Google,” or at least that’s the web search of choice worldwide by a startling 90 percent. Google just rolled out a “Web” search option along with its usual Images, News, Shopping, Maps, etc. tabs. It might just be a big deal. But wait, isn’t “web search” what you’re supposed to get with a standard Google query, without any need to click on a secondary tab? Yes and no. Google’s official SearchLiason Twitter account explains that the Web tab filters results …