Lobste.rs is a curated, invite-only site where you can get banned if anyone you invite (or anyone they invite) causes problems, because those relationships are graphed. Every new member is a burden and every post a potential risk. Obviously, such a community would self-select for safe, uncontroversial content, and tend towards reposting things which have proven uncontroversial elsewhere.

That said, I personally prefer their layout to HN, it maintains simplicity while allowing for a better feature set.

So I am hostage to my friends comments, or only people with bad judgement invite others?

Sounds odd to punish the inviter

Obviously, you'll be fine if you only invite the right sort of people, and you'll be better if you never invite anyone at all.

A community run on the premise that the Eternal September effect must be avoided at any cost, inevitably, will come to see new membership as toxic.