ADMICRO

Curious about which digital camera is best for you? Where you can hear reggae music in  Toronto? Or what the distance is to Mars? Question-and-answer sites offer an alternative to the  ubiquitous search engine: a place to post a question – and then wait for another Internet user to  respond. 
The idea isn’t new: Usenet newsgroups have let us do this for years. But Q&A sites offer features that enhance and simplify the process. All offer eBay-like feedback, where users rate the  helpfulness of experts: over time, these scores become a benchmark score for determining how  trustworthy someone’s answers are. Question-and-answer sites also e-mail you when an expert has responded, and they offer personalized page where you can see the questions you’ve asked, the  people who have responded, and what they’ve had to say.

The main idea of this passage is that ....................... 

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