Tom,
I don't think it is necessarily cliques, although there are some people who do mostly interact with a handful of people. There are some people I probably give more karma to than others, but I give it to a lot of people, including a lot of new people. Each person has their own criteria for why they give karma. Some hand it out sparingly, and some hand it out freely. I tend to be pretty free with it, as I like to give people a little "pat on the back" as often as possible. I know it makes me feel good to get karma, so I try to give it out as much as I can. I think the more you post, the more chances you have of getting karma. I also think that giving karma often results in getting karma (not necessarily right away, but eventually).
Barbara
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