I worked at reddit for almost 4 years, but quit and started a non-profit so I could work on building a site that would be able to stick to the principles I believe are important: no advertising or investors, open-source, privacy, higher-quality content, etc.
It's not incredibly active yet since it's in invite-only alpha, but it gets several hundred posts a day and is coming along well. There's more info in this blog post (including how to request an invite): https://blog.tildes.net/announcing-tildes
Just send me an email if you're interested and I'll give you an invite. It's not intended to be much of a barrier, I just want to keep the growth controlled for now while we get base features and site culture built up.