Ensure appropriate subscribers to each SNS topic

AWS Simple Notification Service (SNS) is a web service that can publish messages from an application and immediately deliver them to subscribers or other applications. Subscribers are clients interested in receiving notifications from topics of interest; they can subscribe to a topic or be subscribed by the topic owner. When publishers have information or updates to notify their subscribers about, they can publish a message to the topic which immediately triggers Amazon SNS to deliver the message to all applicable subscribers. It is recommended that the list of subscribers to given topics be periodically reviewed for appropriateness