How to Join LinkedIn without an Invitation
Open Your Inbox and find open e-mail from LinkedIn Email Confirmation with the subject line Please confirm your e-mail address.
When you open that e-mail, you should see a request for confirmation, as shown in Figure 2-14. Either click the Click Here (to Confirm Your Email Address) link or copy and paste the URL provided in the e-mail into your Web browser.
When you click the link, you’re taken back to LinkedIn and asked to confirm your address.