The unavoidable trend is users who've been here a few months posting comments about how HN is turning into Reddit.
Hmm, I could actually solve this problem with software; I could make it impossible to post a comment containing the term Reddit till an account was over a certain age threshold.
That's a bit Orwellian, since it's outright censorship. Might be better to make it subtler, like allowing the post but replacing the the word "reddit" with "fnord".
First it was Digg, then Reddit, now it's HN's turn.