What brought me here was an offhand comment somewhere deep in the bellow of Reddit mentioning Hubski.
What got me to come back was the often wonderful conversations and a warm welcome by thenewgreen himself.
What has kept me coming back here nearly every day for the past years (reading everything religiously) are the people. The problem with online communities in general is that they are too impersonal, creating a distance that kills empathy, sympathy and compassion. Hubski is small, slow and personal enough that it has become the only site I care to contribute to, and the only site where I've actually met people from.