I'm a moderator/admin on echojs. What's funny is that all the links are rel="nofollow" and still I delete 2-5 posts a day that are anything from outright spam to blogspam that is all unrelated and/or useless. The comment spam is even worse on most sites, and I'm not sure what the real solution might be.
With new legislation all over the world, particularly in the EU, it's going to be harder and harder to create content or let users interact. Which is moving ever away from the core of the internet's creation which is letting people make stuff. Sites want to be both publishers and platforms and are starting to actively censor. Even if I disagree with the content it's a really slippery slope and already starting to see a lot of unintended consequences.
It really feels like we're heading into the internet dark age.