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On the second point, I actually think this method of new content discovery is superior than seeking out new subjects to look up. More serendipitous, exposes you to more new topics, and does so at a higher level of quality as long as you're following generally quality posters.to make sure I'm seeing interesting political dialogue is follow a user who seems active, intelligent, and focused on politics! Sure, I'll get some of his other posts as well, but they're more likely to be submissions which I'm interested in rather than what hundreds/thousands/millions of users are interested in.