CEOs and other high-ranking executives are some of the most active Internet search users at large companies, according to a study released last week by Google. The survey, done in conjunction with Forbes Insights, gathered responses from 354 executives at US companies with annual sales of more than $1 billion. Of the senior executives interviewed for the survey, 92% said that searching online was a valuable source of business information, and more than half said they preferred to do the searching themselves, rather than delegating the work to others.