Turn your Gmail inbox into a supercharged rolodex and social network hub with Xobni's free Smartr Inbox add-on, available for Chrome, Firefox and Safari. The tool scans for and compiles a comprehensive list of your Gmail, Facebook, Twitter and LinkedIn contacts.
Your Gmail inbox will feature a sidebar showing your contacts' photos and recent social media updates; when you open an email, the same info is displayed for the sender. Click on a contact to see a complete profile that includes past emails you've exchanged with them. Robust search functions mean you'll never lose a contact again -- and you don't have to leave your inbox to find out what your friends and professional contacts are doing on the Web.