Social Networking

https://drupal.org/project/socialmedia - The social media module helps integrate your website with social media sites such as Twitter, Facebook and Google+. It provides an centralized way of managing social media profile information and plug-in widgets such as follow and share buttons.

Utilities

https://drupal.org/project/widgets - enables you to centrally manage and configure code snippets on your site such as share and follow buttons or Twitter updates and Facebook like boxes. It implements a user interface that allows you to easily organize and configure various widget elements. Using a UI similar to core�s image styles, elements can be assembled into widget sets which can be reused throughout the site via blocks and other render displays.