Open rate varies a lot city to city but we see anywhere between 20%-60% opens across all of the issues. We still use twitter/facebook to spread our blog posts,

Open rate varies a lot city to city but we see anywhere between 20%-60% opens across all of the issues. We still use twitter/facebook to spread our blog posts, archives, etc but email is our main channel of distribution. For us we see twitter bringing ~30% of our subscribers, facebook doesn't do so well for us.