I think in most cases with public, online, asynchronous communication, it probably makes the most sense to just exit without a message about it.
In a minority of cases, though (e.g., where I’ve engaged in a series of back-and-forths and then abruptly stopped responding, or where someone asks me a direct Q or what-have-you), I find that I want an easy boilerplate way to notify others that I’m unlikely to respond more. I think “(Leaving orbit. 🙂)” or similar solves that specific problem for me.
I think in most cases with public, online, asynchronous communication, it probably makes the most sense to just exit without a message about it.
In a minority of cases, though (e.g., where I’ve engaged in a series of back-and-forths and then abruptly stopped responding, or where someone asks me a direct Q or what-have-you), I find that I want an easy boilerplate way to notify others that I’m unlikely to respond more. I think “(Leaving orbit. 🙂)” or similar solves that specific problem for me.