I am glad to present the next update of the application.
I decided to choose AskSteem as an api for posts aggregation and I transferred all the work to it, it’s good that the application architecture makes it easy to do. Now, the application is still working without its additional api, but perhaps it will be used to display users on the map.
Unfortunately, (AskSteem Maintainer) has disabled filtering by users. But he said that perhaps in the near future it will become available again. Then it will be possible to display users by their locations on the map. Otherwise, it will require its own back-end service.
Using NuxtJS it became possible to support two versions for the application at once.
SPA Version does not store auth data (authentication token) in localstorage, therefore, it can be deployed on any domain, but it also requires authorization every time the application starts in the browser.