LinkedIn - The Unofficial Guide

LinkedIn is the largest professional networking site on the internet, with more than 50 million professionals from over 150 countries and 150 different industries that makes it easier to meet people, whether you are looking for a job, a lead for a project, or perhaps seeking out an industry expert.

While LinkedIn has only recently added some of the functionality (such as group discussions) that people are familiar with in social networking sites, their core value proposition is unique among the major social networking sites. LinkedIn's focus is on helping people leverage their existing network by making introductions and referrals through established relationships. While many users have adopted a more "open" approach, connecting freely with people they don't know, it is LinkedIn's high-efficiency, low-noise basic approach that has attracted LinkedIn's higher-end demographic.