Sometimes it is non-urgent non-important communication about something which makes the poster excited, Sometimes its status of the work they were doing Mostly s

Sometimes it is non-urgent non-important communication about something which makes the poster excited, Sometimes its status of the work they were doing Mostly stuff which if required at all, could easily wait till business hours. I understand that they might not explicitly expect any responses. But the timing of the posts makes me nervy - ungodly hours - and esp coming from higher ups. Is all that innocuous?