What is the name of the service that allows users to use social media accounts to gain temporary access to the AWS platform?

Web Identity Federation is the correct choice as it allows users to access AWS resources temporarily using their social media accounts or other identity providers, such as Google, Facebook, or Amazon. This service enables users to authenticate via these external identity providers instead of creating a separate AWS account, thereby streamlining the authentication process.

With Web Identity Federation, developers can set up roles that grant permissions to federated users who authenticate through their chosen social media accounts. This method enhances security by allowing temporary credentials and minimizes the management overhead of handling user accounts directly within AWS.

The other choices do not accurately describe the service. For example, Temporary Access Service and AWS Social Access are not recognized AWS services, while Identity Service for Access does not specifically convey the functionality related to federated access through social media or web identities. This understanding of Web Identity Federation is crucial for developers looking to integrate third-party sign-in options within their applications that leverage AWS resources.