Go to this page in MailChimp to get all of the keys and IDs you will need to enter into Twitter.
Lists >> Drill into a List >> Signup Forms >> Forms Integration
Build your mailing list by adding a signup form on Facebook!
Ok, so I'll admit - I don't actually use Bing when searching the web. Lots of other people do though so it's important to remember to submit your website to them.
To do this you'll have to go to Bing and set up a Microsoft account.
An important piece to SEO is submitting your sitemap to Google. Here's how you can do this: