Social capital
From Deliberative Democracy Institiute Wiki
Social capital is the strength of the connections between people in a group. As the connections become stronger, the group can become more coopertive.
It is strengthen by day to day exchange of benifits, according to the Tit for Tat theory and by elevating the emotional emotional "chemistry".
As the networks of social objects (NSO) is getting coherent, the work done by the group can be more coordinated.