Back then, the show's blog was already in full swing; now it's even more so, with show highlights, previews and interaction with the various commenters. The categories that the authors are selecting fit right in with the show as well: 1960s Handbook helps we modernistas understand what life in the Kennedy era was like; Fashion File is a testament to both the cool styles of the early 'Sixties and the difficult and detailed work that the fashion designers perform for each episode.
There's also a very active forum, Mad Men Talk and a contest: the best impression of a character (by popular acclaim) wins a walk-on role on the show. And naturally, there's the long-standing Facebook group.
But now it looks like the show's marketing team has stepped up the game again by really jumping into the social media space. Mad Men - this show with such rich characters - is now on Twitter. Specifically, you'll find the following characters there, tweeting with each other and with you, if you "@" them:
To the marketing geniuses behind Mad Men, I say, "Well done!"