In fact, I think it can be done just by the feed itself without any third party service. For example, right now when we publish an article, it comes as a notification. So if appyet set up a function in which we can add specific feed for notification(for example, an entirely new blog only for notification function) and when we post to this blog, appyet should treat the content as a push notification and not an article so that it won't come as an article, but as a push notification. But not sure about clickable link notification etc