Social Networking with BuddyPress - Nettuts+
http://net.tutsplus.com/tutorials/wordpress/social-networking-with-buddypress/

BuddyPress adds Facebook social networking features to WordPress blogs.

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Automattic, the company behind WordPress (WordPress), is moving into social networking, with the 1.0 launch of BuddyPress, an installable, open source software platform that runs on your own website. The software is freely available, and can be downloaded from BuddyPress.org.

How to Create your own BuddyPress theme (Part-1) - http://www.1stwebdesigner.com/tutorials/create-buddypress-theme/

In this 2st guide of the series we'll be making a buddypress child theme, which will only contain 2 files, this is to ensure your theme is as future proofed for BuddyPress as possible.