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All right, thanks for that. The short version of my answer is the same as the long version of my answer: If you clutter up my #space feed with Neil deGrasse Tyson love-ins I can ignore you. Subreddit crawl is a problem in that subreddits are one-dimensional. By allowing your users to subscribe to both tags and other users, you create a two-dimensional subscriber space. Granted, if a person posts three lame things and one awesome thing I might miss the awesome thing because I'm ignoring them - but if I see one awesome thing in a miasma of crap I can follow the person who posted the awesome thing without having to worry about the miasma.