I have written glowingly about Quora and Twitter's weekly digest emails. Well here is another good one from Twitter that is beautifully put together: "Ryan Spoon, we found some people you may know". I love how it shares the same format as the "What's happening on Twitter" digest - and I love how it's very visual, beautifully branded, and actionable: big follow buttons. E-commerce companies have long been reliant on email to drive all stages of the funnel: user acquisition, user activation and user activity. For non-transactional companies, I believe email can be equally vital and - in some cases - more compelling for consumers precisely because it is not commercial. The trick of course is to make it relevant, timely and appropriate (content + frequency).