Not just politics. I looked up something about color e-readers yesterday and followed what at first seemed like a helpful Reddit reply suggesting some different products...only to discover that far from linking to the product or review pages, they all pointed to other Reddit posts.
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[ 2.6 ms ] story [ 19.9 ms ] threadNumerous studies have shown left wing bias at Reddit. Average sub moderators trend significantly farther left than average readers, too.
Note that this is not about the real-human-side bias, I'm only talking about manufactured traffic.