Linkedin Introduced new optional feature that adds another layer of security to your LinkedIn sign-in: two-step verification. According to LinkedIn blog, "All LinkedIn accounts are already protected by a series of automatic checks that are designed to thwart unauthorized sign-in attempts. Now, we are introducing a new optional feature that adds another layer of security to your LinkedIn sign-in: two-step verification."
Just few weeks ago Twitter was started two step authentication. Turn on Two-step verification for your account now by going to Settings, selecting the Account tab and clicking Manage security settings option. Once you login your account Linkedin will send you a code via SMS, also it will ask you about to do once per device. You will also get notify in email that your account is signed into a using a new device. Watch Step-by-step instructions below: