In the crypto world, there seems to have emerged an (in my mind, quite socially healthy and highly commendable) institution/tradition/ritual of sending a text or WhatsApp message just saying "Gm!" (meaning "Good morning", not using quote marks, but you can use the exclamation mark) when you "arrive on the scene" (so you can actually send it at any time of day, which means that you can still send it in the afternoon or night, just send it if you haven't communicated with the other persons since the 'previous start of a (working) day'. Personally, I think the best way to think of this is as a kind of "icebreaker", a kind of semi-implicit acknowledgement that the 'social ice' needs to "icebroken" every working day for people who "work together but don't live under the same roof" something which is a key "social challenge" for introverts. That 'arriving at work and not breaking the ice' thing is something that needs to be tackled for those of us who don't feel a compulsion to 'meet and greet' when we 'arrive among others' and workplace arrival is just such a thing. It might sound a bit weird 'sending a text message when you're sitting in the same office', but as I say, anything to 'break the ice' helps deal with the fact that 'meeting and greeting' is something introverts tend to feel uncomfortable about initiating when they arrive every day, yet also feel uncomfortable with and stressed out about the consequences of not having done it.