Concepts are funny old things.

One struggles to define Web 2.0 and social media to the uninitiated, even explaining Enterprise 2.0 and the Attention Economy to the initiated (unless you’re Mike).

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Then you get arcane and difficult concepts like Zeitgeist /ˈtsaɪtˌgaɪst/ Pronunciation Key – Show Spelled Pronunciation[tsahyt-gahyst], Stream of Consciousness, Knowledge Management and Schadenfreude /ˈʃɑdnˌfrɔɪdə/ Pronunciation Key – Show Spelled Pronunciation[shahd-n-froi-duh].

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The first three are best explained by pointing to things like tag clouds, tumblr, social bookmarking.

The last is best explained by how you felt when Australia and New Zealand exited the Rugby World Cup