You probably noticed the "Share On Twitter" box on the right of the Facebook area we just used and might be thinking we were going to do something similar.... And you would have been right had Twitter not just cancelled the functionality on March 1, 2013.
So instead we're going to skip over this part and go with another solution called Pay With A Tweet. It's a very common solution to accessing content for free.
Click on "Create A Pay Button" to get started. Fill out the fields on the next page (there are popups if you need help).
Once you're done, just grab the second bit of code (it's an iframe).
Now head back to your Unbounce page and select which part of your landing page you want it in (bottom, top etc) and open the source code editor to paste the iframe into it. You can also double click the Twitter box and paste it in there as well.