Mail Chimp just launched MailChimp v5.2 across all accounts.
There are major social integrations, plus major updates and enhancements to existing features, like full-screen content editing, list/group batch edits, and more.
I’ts full of Social Media integration and apps!
Free for the first 500 subscribers and great New features all the time – I say Mail chimp is the way to go!
Check it out at http://www.mailchimp.com