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How many degrees between my wife and me
It's a new meme today. We are living in a six degree small world. However, from the experience using some SNS(LinkedIn, Orkut, Friendster, etc.). I found the number of degrees can't be simply set to integers since there are still many differences in your connections even they show same degree. e.g. I and my wife are now in one degree separation in linkedin.com, however, it's obviously that we are closer than other one-degree connections, either in life status or trust level.

So I guess we are in a 0.5 degree separation. Any theory supports me? Or I have to develop my own theory about it? Ha.