Should we invest in social capital?

I assume that you are talking about social capital in the sense of social networks that make it easier for people to interact with one another.

If that is the definition of social capital, then I think that it is premature for the government, at least, to spend money to create it.  I have read pieces that argue that social capital is a good thing for businesses to invest in.  These pieces have argued that more connections between employees in a company lead to greater productivity.

I would say that this is an area in which we should let businesses invest if they like.  If their experiences show that social capital can have positive results, then it would be time for government to invest in it.