The recognition of the international role of the paradiplomatic initiatives of local authorities, in combination with the limited academic attention of paradiplomacy for city networking, set the framework of the present article. Its main theme is focused on the participation of the Greek municipalities in European social city networks during the programming period 2007-2013. The general research finding of the article is that the participation of Greek municipalities in European social city networks entails changes at the levels of structures, policies and procedures, but the above results are filtered by the endogenous framework of mentalities, bureaucratic procedures and organisational deficits of local government.