Dear Sir:
The problem about your image also can not fix because your image is too small while the frame image is too big.
The best solution is find good quality images with higher resolution.
Hi,
Sorry for reply my delay!
You try to add these lines to the file jux.dcsns.wall.css:
(root/module/mod_jux_social_stream/assets/css/jux.dcsns.css)
#content .stream li.dcsns-facebook-text .section a {
    width: 165px! important;
   height: auto! important;
   margin: 0 4px 4px 0! important;
}
.stream li.dcsns-facebook-text .section img {
  height: auto! important;
  width: 100%! important;
}
Hope it help you!