You can add multiple email ID to your 
OR 
account.
Why you want to link this?
Most of the users have more than one email id..one/two personnel email id, one business email id etc..and if you link all in one social connector account, its very easy to track others, whether it is business contacts, collegues or friends.. How to do it.
Go to your profile home page, and click on top right cornnet Account
Click Account settings…and click “change” on the Email tab
Enter the other email ID here and click “add new” (If you have more than one email id other than the primary one..keep on add here)
REMEMBER : When you add an email id here, there will be a confirmation email send from this account..please confirm it back so that the email id you added get registered
Once you finish adding and click on the confirmation email(s), you will see the account like above, where your primary email id is now been selected in the radio button.
Thats it for FACEBOOK
Logon to your linkedin profile and go to the top right corner and click “Settings”
Under Personnel information, Select Email Address
Add your other email id’s here…
REMEMBER : A Confirmation email will be send to each of the email id you add..
Once you done..your email profile will look like above…
That’s all
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PREMNAIR'S Blog 