Oh yes, look at the parent, get a list of interested people, then look at *its* parent, get a list of interested people, then *its* parent, and so on. Then de-dupe the list, then mail it out efficiently. That alone could get quite expensive.
You also need a database schema change to somehow record a list of people who want to be mailed about posts. Plus the interface for users to add and remove themselves from those lists.
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