Go to Bitbin.it and make 20 Pastes.
Copy the links and put them in Notepad like so:
<iframe src="Link"></iframe>
Copy the iFrame code 15 times and replace each link in the iFrame code with a link to one of your posts. Use different links for each one
Like this:

<iframe src="http://bitbin.it/vvCelke4"></iframe>
<iframe src="http://bitbin.it/Fo1mYR9f"></iframe>
<iframe src="http://bitbin.it/1BqyovpH"></iframe>
<iframe src="http://bitbin.it/Q239047R"></iframe>
<iframe src="http://bitbin.it/kOJJIfZ1"></iframe>
<iframe src="http://bitbin.it/lLd5BXQH"></iframe>
<iframe src="http://bitbin.it/KtUYVCyA"></iframe>
<iframe src="http://bitbin.it/IK084YvF"></iframe>
<iframe src="http://bitbin.it/efrxdvXq"></iframe>
<iframe src="http://bitbin.it/H5sbpSeg"></iframe>
<iframe src="http://bitbin.it/BtI4gaVj"></iframe>
<iframe src="http://bitbin.it/t3qsulED"></iframe>
<iframe src="http://bitbin.it/esvx3o92"></iframe>
<iframe src="http://bitbin.it/ZmmyUvHM"></iframe>
<iframe src="http://bitbin.it/E7nHoRAJ"></iframe>
<iframe src="http://bitbin.it/QKsJaLWJ"></iframe>
<iframe src="http://bitbin.it/GGxNSs1V"></iframe>
<iframe src="http://bitbin.it/1ekBt1pl"></iframe>
<iframe src="http://bitbin.it/YrNktaOv"></iframe>
<iframe src="http://bitbin.it/o89C22Nw"></iframe>
<iframe src="http://bitbin.it/Oag2t0VF"></iframe>
<iframe src="http://bitbin.it/XLJixN24"></iframe>
But do it with all of your links.