Semantic Web 可以“理解”搜索关键字的含义及上下文，因此可以为用户提供更准确、更有用的搜索结果。而现有的搜索引擎，如 Google 和雅虎等等，主要采用匹配的搜索模式，往往会产生大量冗余或无意义的搜索结果。语义网络可以直接回答用户提出的很多问题，例如“曼联队曾经多少次获得足总杯冠军？” 如果说 Web2.0 以用户为中心，那么 Web3.0 就是一个为用户提供更多可能性的平台。 Semantic Web 的一个经常被提及的好处在于它是一个世界，在那里智能代理从用户获得象英语式的指令（形如 a week in Miami in March with a car for the

lowest price possible ），接着遍历整个互联网读取元数据以便产生最佳结果。

API services form the foundation layer. Google’s search and AdWords APIs, Amazon’s affiliate APIs, a seemingly infinite ocean of RSS feeds, a multitude of functional services, such as those included in the StrikeIron Web Services Marketplace

Aggregation services form the middle layer. various RSS aggregators, and emerging web services marketplaces

Application services form the top layer, such as CRM, ERP or office, but a new class of composite applications that bring together functionality from multiple services to help users achieve their objectives in a flexible, intuitive and self-evident way.

Social system support for your great idea Do not let it be iceberg any more..