Because of its numerous advantages, e-mail has become an important means for connecting people in workplaces, a supplement for other organizational communication channels, and a support for diverse interpersonal and group interactions and activities (see Haythornthwaite, 1998). Other online communication technologies have also found their place in the organizational environment, including various meeting support tools, voice and video conferencing tools, instant messaging, chat, group calendars, and repositories of shared knowledge (Olson and Olson, 2003). For instance, use of instant messaging adds speed and ease to workplace communication and can increase connectivity and a sense of community within organizations (Quan-Haase et al., 2005); it can also improve the working relationship with co-workers within departments, across departments, and outside the organization (Cho et al. 2005).