Social Media Marketing is an an interesting mix of marketing, PR, sales and customer service, and is about engaging with communities. Famously, Dell now does this well, and are no longer in Hell. My friend Mr Whatley does a great job of this for SpinVox, IMHO. To do this, of course you need access to the internet.
But there is another way. It just takes doing something brilliant, like making your store front completely kick ass.
So you make something that rocks, ahem. Then you add the extra piece of genius, which is to make the dials go all the way to 11.
The design and the comic flourish disrupts expectations and connects with a shared passion.
You have created a piece of Social Media without access to the internet.
Then someone takes a photo and puts it on Flickr. And you have yourself a piece of awesome internet marketing without even turning your computer on.