An Email confirmation link is sent to you only when you sign up through Email.
If you signed up through Email and still did not receive a link for confirmation, first check your spam/junk folder - your Email client might have some filters that pulled this notification into junk mail.
If you still cannot find it, you can select the appropriate user from under All Registered Users and then click on Resend email validation.
While logging in through Facebook or LinkedIn there is no email confirmation process required. You move directly into the ‘Email ID confirmed’ state.
(This is because you had already completed this step, to confirm your email, back when you signed up for LinkedIn/Facebook.)
P.S. You can learn more about the sign-up process here.