Doyin Faith Kasumu demonstrates how to write a handy WordPress plugin that brings in a Twitter-like mention feature into your WordPress site.
Enhance Your WordPress Comments with a Mention Feature
Your Own Custom Annotations – More than Just Comments!
Danny teaches you how to build Doctrine-style PHP annotations for your own custom projects!
Social Network Style Posting with PHP, MongoDB and jQuery – part 1
Learn how to build a prototype version of a social network type post mechanism with jQuery, PHP and MongoDB