LinkedIn also introduced two-step verification system for their users to give extra security. To enable it, simply login to your LinkedIn account and go to Settings -> Account -> Manage Security Settings.
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Activate the Two - Step Verification system by adding your mobile number. You will get a verification code to your mobile and asks to enter that code. That's it! You enabled the Two - Step verification system.
If you want more information you can visit Slideshare - LinkedIn for LinkedIn's Official Step - by - Step procedure.
[Source: LinkedIn Blog]
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