You are not obliged to share your contacts. Usually, you can hide them from the other members, and decide or not to forward a request of contact from another member.
You are not obliged to upload all your contacts, so you control everything.
One more time, sharing is winning and this is the basis of networking: you help people, introduce people, you create opportunities for your contacts, the contacts of your contacts, and for yourself!
We all create value together.
Technorati tags: Networking Social Networking, 6 degrees, Online
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