
Mostly tech related communities exist right now. The experience is like a well-executed mashup of Reddit, Slack and Twitter.
I've been using Spectrum for the past couple of months and it's been a great way to engage with communities that I'm not only heavily involved but also casually interested in.
Definitely check it out if you haven't all ready.
I have tried it and I like it, it offers many opportunities to contact people of your sector and interests.
Explored this product as a potential future option for our open source community. However, it was lack luster and underbaked. We currently use Slack and can't find any reason to explore Spectrum beyond my initial investigation.
Spectrum is awesome. It's like what everyone wishes social networks would be, but can never find because they are too individually centered. I have high hopes for this platform.