Any given situation permits human beings a specific possibility to act. Nature offers many ecologies in which human beings can breath and act and so does the human constructed world. Human beings enjoy a variety of environments, provided they are capable to adapt their behaviour to specific requirements any environment demands. Also social situations require an adaptation of behaviour to survive and be well. The possibility and potential to act, is defined by social, cultural and ecological contexts. Technology offers new possiblities to act. Online reality is constructed by 'words that act', triggering series of transactions, which are ultimately experienced as interaction. Situated ageny in mediated presence is not only defined by social, cultural and ecological restraints. In mediated communication technology formats human presence and human agency in such mediated situations is defined by this formatting.