I like the "hello" before someone engages in a chat because this way I can confirm that i) I am available to talk and ii) the message is safe (i.e. I am not displaying in front of 200 people and forgot to switch off IM).
If someone just wants to send me an information, email is great for that.
My personal order of contacts is snail mail → email → IM → phone → in person. Each of the steps is one order of magnitude of urgency greater than the previous one.
If someone just wants to send me an information, email is great for that.
My personal order of contacts is snail mail → email → IM → phone → in person. Each of the steps is one order of magnitude of urgency greater than the previous one.
There is probably also a cultural component.