If anyone else tries to figure a way to organize twitter followers into lists AFTER the fact, here's what I did....
I DO NOT work for socialbro.com nor social oomp.
I simply signed up for the socialbro.com service and the tool provides the ability to filter twitter followers (and people you are following) by search keywords (across bio and tweets), geolocation, and several other fields. This capability made it easy for me to search for users and then apply to specific lists we've recently established.
Moving forward we are using social oomph to assign new twitter followers to lists as we acquire them. In Social Oomph, followers can be assigned automajically based on keywords or through manual selection.
