WARNING – DO NOT TRUST THE ABOVE ADVICE
Social.png actually contains PHP code that is usually called from another file(s). The code is malicious and happens when you download the plugin not directly from the developer.
I would not trust the above advice, as there is most likely other malicious code in the plugin(s) in addition to the Social.png
It is also my belief that the above people, due to their lack of posting, are people who have a vested interest in the malicious code.