Richard McManus of Read/Write Web provides a short and useful introduction to semantic webapps by listing the top 10 of such apps.

What is a semantic app:

A key element is that the apps below all try to determine the meaning of text and other data, and then create connections for users. Another of the founders mentioned below, Nova Spivack of Twine, noted at the Summit that data portability and connectibility are keys to these new semantic apps – i.e. using the Web as platform.

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