I lurk here. I've also been a reddit lurker for quite some time. On reddit - I kinda do use the site as an Internet(s) Front Page - I've never really engaged it as a "community" - though I obviously recognize that it is.
When I discovered hubski - I fell for its design and its tone - both of which seem unique to me. The site is elegant and the community is - I want to say, "calmer" than most.
That said, the primary reason that I initially returned to hubski - and then worked it into my online-routine was because of the Personal Content Isn't a Sin policy. I'm an artist - that's what I do - I've long been frustrated by the notion that as an artist I'm not supposed to speak for myself in most communities. Further that - in many places - doing so is essentially an invitation for venom.
So once I found a place where I was encouraged to speak for myself without denying either my nature - or my occupation... I pretty much just lurk. #chortle
This site is one of the first places I visit when begin most leisurely surf sessions - I enjoy the way this community curates topics.