Is there a call that I can use from the REST API to get all of the users that have subscribed to a particular Blog?
This does seem to be the behavior for that endpoint. There is a supported in-process public API for listing subscribed users, but it is unfortunately not also wrapped with either a REST API nor widget API extension.
The in-process API for listing subscribed users is:
var api = Telligent.Evolution.Extensibility.Apis.Get<Telligent.Evolution.Extensibility.Api.Version1.IApplicationSubscriptions>(); var users = api.SubscribedUsers(Guid applicationId, ApplicationSubscriberListOptions options = null);
I am logging the lack of REST and widget APIs for this as a bug. In the meantime, you could add your own REST endpoint plugin to wrap the supported in-process API.