Downvotes are one thing, but I don't think of that as astroturfing. On reddit, I much more frequently question the content of actual comments. Especially when i

Downvotes are one thing, but I don't think of that as astroturfing. On reddit, I much more frequently question the content of actual comments. Especially when it comes to posts regarding high budget entertainment, like for movie trailers and games and the like. There's just too many blandly positive short comments... I don't get the impression that happens on HN nearly as much.