If Facebook is the equivalent of people that gather in the kitchen at your house party to do tequila slammers and Karaoke and talk about there holidays. Then Linkedin are the people that gather in your entertainment room to admire your 50″ TV and talk in hushed tones about job opportunities, wage scale and meeting up to discuss that joint project. Each one has its place and for Linkedin that place is firmly in the realm of business. Through Linkedin you can join as an individual or a company. You can ask questions, find jobs and give advice. Join one or more of over 10 million groups. Increase your customer base and much more.
Check out the link below for a stunning infographic on how linkedin works in detail.