One of the downsides of all this advanced communications technology (i.e. e-mail, instant messaging, cell phones) is that it creates an expectation of immediacy. The basic reason of being inaccessible no longer seems as valid when it’s nearly impossible to ignore all the devices. One of the only reasons there’s no response is that the responder just hasn’t felt the need to respond yet. This creates a kind of guilt on the part of the responder, whether or not the lag time is valid.