At its most basic, this extension uses Attentive.ly to retrieve accounts for contacts by matching their email against over 100 social media sites, including Twitter, Facebook, LinkedIn and Google+. It also allows searches to be made for keywords in their posts to these accounts, looks up Klout scores to determine how influential your contacts are on social media to assist in segmenting and targeting your engagement efforts, and displays an image of your contact if one is available from gravatar, Facebook, or LinkedIn.
This extension provides email delivery for CiviMail and/or other email from CiviCRM via the Mandrill service. Mandrill is an email service that runs on the email infrastructure that powers MailChimp. It is a high quality, low cost option for email delivery, with no loss of delivery functionality, quality or performance in comparison with alternatives.