Notably, the stages of CPM represent a subset of potential disclosure boundaries in HCI. Palen and Dourish's [26] exploration of boundary regulation in HCI identified three salient boundaries: the disclosure, identity, and temporal boundaries. The temporal boundary is particularly interesting in the context of social network sites. Information disclosures may be viewed in relation to the boundary, having different meaning at the time of disclosure t1 and time t2. At a general level, boundaries in a socio-technical system are metaphors that inform conceptions of the range and audience of disclosures. In Facebook, individuals construct rules for disclosure based on technological affordances and