To start, I'm thinking of tests for things that aren't cultural trends, like the fist bump: I think some differentiators between the two types of work under th

To start, I'm thinking of tests for things that aren't cultural trends, like the fist bump: I think some differentiators between the two types of work under the umbrella term 'hobbies' is: It's something where people are asking the question, "What can I do with this now, that I couldn't do before?" Hobbies like stamp collecting, or star wars trivia seem to fail this test. It's something where other people can build upon the hobby to do other things. Hobbies like being a foodie and MUDs seem to fail this test. As far as I can gather, it's people taking advantage of a new piece of knowledge or technology to try to figure out what new things it enables them to do.