Final answer:
The most complicated form of metrics in social media examines the patterns of financial contributions, evidenced by massive fundraising during the 2020 Presidential election and substantial donations to nonprofits by engaged social media users.
Step-by-step explanation:
The most complicated form of metrics focuses on exploring the actions audience members take on social media, particularly in the context of financial contributions to social movements and political campaigns. In recent political events, such as the 2020 Presidential election, a significant amount of campaign money, totaling hundreds of millions of dollars, was raised through social platforms. Moreover, engagement with nonprofits on social media leads to actionable results, with 55 percent of those who interact with such organizations taking some form of action, and 60 percent of this subset (which is 33 percent of the total number of people engaging) going as far as donating money to support a cause.