Consider that most people coming from these sources are just looking for a quick read; they don't have a problem they're trying to solve (referral/search traffi

Consider that most people coming from these sources are just looking for a quick read; they don't have a problem they're trying to solve (referral/search traffic), they just want to be entertained. So I've gotten same number of subscribers from endorsement tweet that was probably seen by a few hundred people as I've gotten from thousands of visitors from HN. It's important to have a good call-to-action for subscribing to the mailing list that is tied to your page content, rather than generic or unrelated. Gotten 3x improvement from that. But it's still a low sign up rate.