Linked In is a professional “social networking” site
Linked In is an online network of more than 30 million experienced professionals from around the world, representing 150 industries.
12.5% are senior management
It is free to join. After you join, you create a profile that summarizes your professional accomplishments. Your profile helps you find and be found by former colleagues, clients, and partners. You can add more connections by inviting trusted contacts to join Linked In and connect to you.
Quality: For those that are more private people or who hold positions that don't require you to network your pants off, it's best for you to keep your connections to just folks you know. And use the introductions to really connect those that have benefit to your connections.
Quantity: For others, who are avid networkers and accept all invitations. Those who are also building a business and use LinkedIn as a tool for marketing, advertising, branding, etc. I also accept introduction forwards from my 800+ connections when requested. It's up to the next person to accept it or not. Most folks have a legitimate reason to connect. Just last week I connected distant cousins LOL....cracked me up. Another connection helped one guy do some real estate transactions.
To close, just remember that those with the mass number of connections (Like me) are very helpful people that want to help connect/network. So it's not a bad thing, just what you chose to do with your profile.
Use it on your wireless devices (e.g., Facebook for Blackberry app , or Facebook’s own mobile app .
Go to the main mobile section within Facebook which shows how to upload content from your mobile device to Facebook, receive content from others on your mobile, or just browse Facebook from a mobile-friendly browser interface.
Twitter can be run through your Facebook page, too
You can find friends’ mobile and other posted phone numbers under Phonebook tab
Focus your incoming content feeds on things of interest to recruiters (more about groups, and more about profiles)
Similarly, you can control what friends see about you