[Developers] Freebase data sources

[Zodiac Seven]

Does freebase always get it's data from wikipedia?

I notice that I see relevant links to other sources like - for actors there
is an imdb entry. Is there a list of all possible data sources which I could
use for my mashup?
Also about the images shown on the side, I notice that the uri always points
to http://upload.wikimedia.org... Are there images from any other sources
besides wikipedia?

Regards,

Deepak.
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