Well, my experience in a diabetes forum, for instance, is that there are people of all racees/ethnicities there who all interact in the same way: very supportive and helpful. They are bonded by their shared experience and their shared understanding of what its like to live with the disease, and they feel a very close emotional connection with the other people in the forum. Although some people divulge their race/ethnicity, many do not, and the discussion is not racially/ethnically specific.

And this is what I'm talking about. In the case of the diabetes forum, the group dynamic is determined by a shared experience rather than race, ethnicity, or culture. Those factors are entirely irrelevant to the discussion and the group dynamics, and do not influence how people form bonds or with whom. This is the case with the majority of interactive websites, and this is what breaks down the old group dynamics that are based on race/ethnicity/location/culture, and shifts the formation of bonds away from those that support a tribalistic group structure to a much more universalist kind of group structure.