Web?
There is this thing called a website.
I've had phones since 2002 that managed websites. If you need an app to duplicate phone access for a website, then the website is developed badly.
Let's not have a proliferation of proprietary APIs that often "leak" information they shouldn't!
Maybe some people are concerned about "notifications". Some are a slave to them, but email can work and can pop-up a notification on the phone screen. Or there is RSS.
Sorry I've only crocodile tears for 3rd parties trying to leverage SM, which is dubious anyway.