I understand the sentiment. However, I would also suggest that people cultivate the culture/scene that they want to see.

In my case, I really enjoy games. So I built a gaming platform where I can find fun, independent games. I find it to contribute to the "best of the internet" mentality.

It's really up to the people around who discover and can award the people contributing to the culture that they want to see.

Yeah, it's all about communities, not platforms. What happens is that people find a community they like, then the platform underneath it dies (IRC, MySpace, Digg, etc) and they can't find the same community on a new platform. I've made a lot of friends on Discord, and ionce a year or so when it looks like Discord's about to finally give up we talk about our plans to migrate the community to a different platform. But since the community is the important part, we don't really care about the ills of the platform until it starts to actively hurt the community