It's both fun and work.
It's fun for interacting to posts which are entertaining, informative and challenging. The subject induces funny things and out of nowhere just to talk about.
It's a form of work for there are quota to meet, research to submit. And there's a time frame or schedule to beat. If it couldn't be met, no earnings to receive.
I prefer to stay with those sites in which I am free to do my will to interact or not and to visit at my convenience.