2015-09-18 UTC
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Zegnat A good sell used to be “because Google”, but I am not sure if Google even indexes mf2. Currently the best why I can think of is “so people can build tools that understand what the data on your websites is”. Another interesting source for examples is rhiaro’s http://rhiaro.co.uk/2015/08/extensibility - marking up vulcano data so other people interested in them can find the info easily.