Under #2, be careful with popups or modals that cover other interactions, Google will now penalize this kind of activity on mobile. I suspect we’ll now see persistent banner style replacements on mobile (a strip across the top of the site that doesn’t scroll off the page or disappear until you close it or sufficient time has elapsed without interaction.)
Even if you've imported an existing list of contacts, you'll still want an easy way for new fans to join your email list. AWeber's sign up forms provide the perfect solution. Create a simple sign up form for your website, and if you don't have a site, we'll host it for you. Grab the link to your AWeber form and share it on Facebook, Twitter, LinkedIn, or wherever your audience is.