Tumblr isn't a bot fest necessarily, but the fact is that any site with a large amount of traffic will generally become a target for bots. It's almost a compliment to a website, but at the same time it can be a nuisance. The Tumblr bots I'm familiar with follow by category and tags, not necessarily post content. The reason the author's blog gets autofollowed is likely because he is in a lucrative niche.
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