The best way for a CIO to justify maintaining and supporting social media platforms is by demonstrating the value derived from investment in social media technologies. Social media platforms are not just tools for communication and entertainment, but also strategic assets that can create and deliver value to the organization and its stakeholders. Some of the potential benefits of social media platforms are:
Enhancing customer engagement, loyalty, and satisfaction by providing timely, personalized, and interactive content and feedback Increasing brand awareness, reputation, and trust by showcasing the organization's values, achievements, and social responsibility Improving innovation and collaboration by facilitating the exchange of ideas, knowledge, and feedback among employees, customers, partners, and experts Supporting decision making and problem solving by providing access to relevant data, insights, and analytics Reducing costs and increasing efficiency by streamlining processes, automating tasks, and optimizing resources

An enterprise code of ethics is a set of principles and values that guide the behavior and decision-making of the organization and its members. It can help to incorporate desired organizational behaviors into the IT governance framework by establishing a common understanding and expectation of what is acceptable and unacceptable, and by promoting a culture of integrity, accountability, and responsibility. Reference:= ISACA, CGEIT Review Manual, 7th Edition, 2019, page 17.

Outcome measures are tools used to assess the effect, both positive and negative, of an intervention or treatment1. Outcome measures can indicate whether a change management process has been implemented successfully by comparing the actual results of the change with the expected or desired results2. Outcome measures can also help evaluate the impact of the change on the organization's performance, quality, and value3. The other options are not the best indicators of successful change management implementation. Maturity levels are a way of assessing the degree of development and sophistication of a process, but they do not necessarily reflect the outcomes or benefits of the process4. Degree of control is a measure of how well a process is managed and monitored, but it does not capture the effectiveness or efficiency of the process. Process performance is a measure of how well a process meets its objectives and requirements, but it does not account for the outcomes or consequences of the process. References:
3: https://www.physio-pedia.com/Outcome_Measures
2: https://www.isc.hbs.edu/Documents/pdf/2020-outcome-measurement-feeley.pdf
1: https://en.wikipedia.org/wiki/Outcome_measure
4: https://www.coursera.org/articles/change-management-process
5: https://www.sciencedirect.com/topics/engineering/degree-of-control
6: https://www.sciencedirect.com/topics/engineering/process-performance