A Soap Opera Series (SOS) is a serialized, cohesive collection of emails based on a theme, idea, or story that serves as a vehicle for people to experience and journey deeper into our world.

Important characteristics of an SOS include:

Each SOS has a beginning and an end.

An SOS can last for days or weeks (longer in some rare examples).

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Enter Substack. Substack, by eschewing the marketing communications (MarCom) market entirely, and focusing on writers people actually wanted to read, reversed the perceptions of the technology. Instead of trying to scam people into giving you “permission” to send them emails, Substack said, why not charge them to subscribe.