rogerd - 4:52 pm on Nov 19, 2009 (gmt 0)
I think your assessment that you need three accounts is correct due to lack of cross-interest. If you promote each one in the venues where you interact with the different groups, you'll get natural growth. You could also use a tools-based approach (e.g., keyword-based following) if you want to get aggressive. That assumes you can segment the groups in some way.