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Facebook launched an early attack with its implication that some people would rather get information from their friends than from an anonymous formula. Twitter’s ability to parse its constant stream of updates introduced the concept of real-time search, a way of tapping into the latest chatter and conversation as it unfolds. Yelp helps people find restaurants, dry cleaners, and babysitters by crowdsourcing the ratings.

Microsoft purchased Farecast — a Web site that tracks airline fares over time and uses the data to predict when ticket prices will rise or fall — and incorporated its findings into Bing’s results. Microsoft made similar acquisitions in the health, reference, and shopping sectors

Google uses signals to ensure that only the most relevant tweets find their way into the real-time stream. “We look at what’s retweeted, how many people follow the person, and whether the tweet is organic or a bot,”

applicants who have bothered to install new web browsers on their computers (such as Mozilla's Firefox or Google's Chrome) perform better and stay in their posts for 15% longer, on average, than those who use the default pre-installed browser that came with their machine (ie, Internet Explorer on a Windows PC and Safari on an Apple Mac)

applicants who belonged to one or two online social networks tended to stay in their jobs for longer than those who belonged to four or more social networks