There is a common assumption that information communication technology (ICT) enables employees to work together and to be virtually co-present, regardless of time and place. However, previous studies of social networking sites (e.g. Facebook and social enterprise media in work settings) show a consistent tendency among users to reconnect and communicate online almost exclusively with people they already know. The paper at hand examines in depth what role shared places have in knowledge work and in creating a virtual or online co-presence among knowledge professionals. The findings of the present study show that the tendency of communicating with known others in online spaces is also at play in the offline workplace, as professionals approach those whom they already know when in need of work-related help. One of the conclusions is that the geographical workplace plays a key role in creating a common ground for communication and social integration among employees, since a core dimension in knowledge work is social interaction. The paper uses insights from a qualitative and longitudinal case study (2010–2013) of a multinational consultancy company.