If we are talking about photographic expression as a marginal art, then I think that the listing, releasing, and viewing of photographs based on the current nature of social networking services such as "Instagram" can be considered marginal art photography.
The fact that it has its roots in the spontaneous weaving of human life clearly explains the nature of Instagram, and the approach by non-specialists to non-specialists (including the masses who have no intention of art at all) and the dependence on evaluation, etc., can be said to embody the reason for the existence of marginal art.