I think this will be a mammoth task but if everyone plays a part in it then it's highly achievable. Building Wikipedia on Hive could be a very valuable information hub. If web 2.0 information hubs are down, Hive will be here.
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It will be more individual groups and communities building what they are experts in. Using the photography example, that community could build a database of relevant terms and concepts. That could help to have that "expertise" on Hive.
Rinse and repeat with different groups/communities.
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