Bud's report on being one of the MadMen twitters is now available - you should go and read it.
I spoke about the glimmer of inflection the episode suggests before and the report makes it very clear that Bud has embraced a convergence culture position to mainstream media.
The convergence in question is not the device / bill convergence of telecoms providers but rather the convergence of modalities.
A blurring of producer and consumer, broadcaster and receiver, writer and reader - a theoretical vision espoused by French deconstructionists that becomes literally real in this digitised networked convergent media culture.
Anyway, it's awesome - go read it.