Create a fake "viral" page with cute cat pictures, jokes or whatever, get it shared on Facebook (which is known for opening links via _blank). Create a "phishing" website at https://fakewebsite/facebook.com/page.html for example Put this code on your "viral" page window.opener.location = 'https://fakewebsite/facebook.com/page.html'; which redirects the Facebook tab to your phishing page, asking the user to re-enter her Facebook password.
Add this to your outgoing links.