Everybody has their own rules regarding whom they follow on Twitter. For instance, some people follow as many people as they possibly can because they think they will gain followers. They might, but their scattershot approach probably won’t add any value to their Twitter experience.
You’ve decided to start an e-letter campaign. Great! E-letters are wonderful things. You can create a template that’s browser and mobile friendly. You can track opens, clicks on links, and subscribes and unsubscribes.