I think the basis for the widespread belief that IM is disruptive is that we don’t have co-workers on our IM, we have our friends
The study challenges the widespread belief that instant messaging leads to an increase in disruption. Some researchers have speculated that workers would use instant messaging in addition to the phone and e-mail, leading to increased interruption and reduced productivity.
Instead, research showed that instant messaging was often used as a substitute for other, more disruptive forms of communication such as the telephone, e-mail, and face-to-face conversations. Using instant messaging led to more conversations on the computer, but the conversations were briefer, said R. Kelly Garrett, co-author of the study and assistant professor of communication at Ohio State.