That is, these are neighbors who actually talk to each other and do things for each other. Common values and shared interests are more like facilitative factors than characteristics or defining requirements.
Shared activities are probably more often a result of interaction and friendship than a cause of it.
I'm implying that friendship naturally develops out of interaction, in varing degrees. Without interaction, of course, there is no chance of friendship. This simple fact seem to have been overlooked by many surburbanites. Many would say they are too busy to interact with their neighbors. The CBC is having a neologisms contest this week.