Social Media Widget not displaying

Hi,
I have another issue. Suddenly the social media icons are not displaying in the footer widget. All three browsers – Firefox, Chrome & Explorer – worked fine a few days ago. Now Chrome has broken image links, Firfox shows the words “facebook” and “youtube” and explorer has broken image symbols.

I noticed on your forum that AdBlock could cause this…not the case with me. I cleared cache on all browsers. Icons not displaying on mobile either. The “header” social images are working fine?

Please advise,
Shelby