The term 'diglossia' introduced by Ch. Ferguson which is widely used by dialectologists and as a rule means simultaneous coexistence of Standard Arabic and vernaculars of Arabic. the idea of diachronically coexistence of various dialects and a kind of more or less standard language known to the majority of speakers on a certain territory has been always accepted by scholars and has found a lot of evidence on examples which range from ancient Greece to mediaeval England and modern China. In Arabic speaking world diglossia existed long before Islam. During the last decades Arabic countries have witnessed dramatic political, economic and demographic changes, introduction of new means of communication and spread of electronic mass media which affected the linguistic state of affairs. Thus it is necessary to revise whether the term diglossia still reflects the real state of the current linguistic continuum in the Arab world. So the question is: does diglossia still exist in the Arab world, or there is mono- or polyglossia?