Try copying this into your sig:
Code:
<a href="https://soundcloud.com/#lschwart/sets/best-tracks">Best tracks on Soundcloud</a><br><br>
<a href="https://www.facebook.com/pages/My-Son-the-Doctor/106839039360158">My Son the Doctor on Facebook</a><br><br>
<a href="http://goo.gl/ZvYPEH">Milton and Maternal Mortality by Louis Schwartz </a><br><br>