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I think some areas will be correlated and some will not. e.g. I see plenty of overlap between articles, podcasts and books, but less overlap between those things and music.

I'm pretty curious to see what the correlation ends up being.

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I agree. I think it's definitely worth trying and maybe you can update the algorithm later to take advantage of the domain correlations you find.

That being said, music etc. is at least correlated with demographics. I could see it being useful to a degree for recommending other content types.

Id be surprised if you get much signal out of demographic info.. but I would think music correlates more with general aesthetic taste which may transfer.

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