This is an interesting (and pretty funny) post from MailChimp data scientist John Foreman about analyzing email addresses. For example, Gmail and Hotmail are similar in terms of number and age of users (although possibly for different reasons), as well as preferred browser. AOL and Comcast email users, on the other hand, are older and interested in way different things than Gmail users. Oh, and a surprising number of people still use the AOL browser.
Story posted at: blog.mailchimp.com