We can tell stories through other types of social media beyond blogs and Twitter. Social image platforms, like Picasa or Flickr, are fine sites for narratives.
Consider the Tell a Story in Five Frames Flickr group. This requires stories to have, well, five images, as you might expect. No text is allowed beyond a title. For example, “Gender Miscommunication” takes us through a short story with only that much material… and how well it succeeds. Social media: note the discussion thread which follows.