Dave Duarte, co-owner of Muti.co.za, has written a blogpost in which he explains Tomi Ahonen"s term, “Seventh of the Mass Media”.
The "seven mass media" are listed in order of their introduction, namely: print; recordings; cinema; radio; television; internet; and mobile phones.
He adds that mobile is often referred to as the "fourth screen" of the media, the first three being cinema, television and the PC.
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here to read the blogpost in full.