Facebook Like Box Specify Image Sizes

While I am analyzing my website with gtmetrix, I see that the facebook likebox iframe, which I have on my website to increase facebook, likes that the analysis of gtmetrix sets the image size parameters.

As I see in facebook css when checking an element on the image, the width and height are 50 pixels.

Can someone suggest some solution for this.

Here is the gtmetrix report:

http://profile.ak.fbcdn.net/hprofile-ak-ash1/t5/1075891_1447553848794414_2054094003_q.jpg (Dimensions: 50 x 50)
http://profile.ak.fbcdn.net/hprofile-ak-ash2/t5/1117019_100001688588210_43083615_q.jpg (Dimensions: 50 x 50)
http://profile.ak.fbcdn.net/hprofile-ak-frc1/t1/c25.0.81.81/s50x50/252231_1002029915278_1941483569_s.jpg (Dimensions: 50 x 50)
http://profile.ak.fbcdn.net/hprofile-ak-prn2/t5/1086379_100007611906546_1473945810_q.jpg (Dimensions: 50 x 50)
http://profile.ak.fbcdn.net/hprofile-ak-prn2/t5/1086844_100002168445689_1856954293_q.jpg (Dimensions: 50 x 50)
http://profile.ak.fbcdn.net/hprofile-ak-prn2/t5/211653_100004667589872_1354932965_q.jpg (Dimensions: 50 x 50)
http://profile.ak.fbcdn.net/hprofile-ak-prn2/t5/276037_1082183683_1868771598_q.jpg (Dimensions: 50 x 50)
http://profile.ak.fbcdn.net/hprofile-ak-prn2/t5/276384_1437164706_1527432832_q.jpg (Dimensions: 50 x 50)
http://profile.ak.fbcdn.net/hprofile-ak-prn2/t5/372083_100003129221075_1067837842_q.jpg (Dimensions: 50 x 50)

Thanks, Any help would be appreciated.