Web Protection - Filtering / Categories

I would like to create new filter categories to use in Web Filter Profiles.
When creating a new "Filter Category"  sub-categories have to be selected.

Are there any lists which websites will be blocked by a certain sub-category?
For example the sub-category "Media sharing" - which websites will be blocked?
How do the sub-categories relate to physical websites? Are there any official blackllists that can be looked up somewhere?

At the moment it's rather more guessing than really deciding which sub-category to take or not.
Who does actually manage those categories and how recent are they? Do they get updated from time to time?

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