Our relationships in life can often be characterized as organic or inorganic, as naturally occurring or as artificial, consciously chosen or constructed. Organic relationship tends to represent strong ties, inorganic relationship weak ties. Inorganic relationships are very powerful, but often can't be relied on when we need them. Organic relationships are the foundational base of social capital.
More on community: https://socialsci.libretexts.org/Bookshelves/Sociology/Book%3A_Sociology_(Boundless)/17%3A_Population_and_Urbanization/17.04%3A_Urban_Life/17.4G%3A_Community
Studies from the JEC Social Capital Project: https://www.jec.senate.gov/public/index.cfm/republicans/socialcapitalproject
Alan Ehrenhalt's The Lost City: The Forgotten Virtues of Community in America: https://www.amazon.com/gp/product/0465041930/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=theurban-20