We try to email our users once a quarter. Unless there is something very specific to the user, like a feature they're paying for, it's not worth spamming your u

We try to email our users once a quarter. Unless there is something very specific to the user, like a feature they're paying for, it's not worth spamming your users' inbox. If you're releasing a new feature every week, have a section on your site dedicated to new releases. Twitter/FB is also great for announcing releases.