This is a very simple question, but could not resist posting it.

What inspired this?

Look at the red arrow. Telling which site this is would make it even simpler.

Cracked by: Goyal , username , Rc , shenoyvarun86 , Priya , Rahulk , Vijay Shankar , K.Manish , Dibyo , Vivek , joe , Keerthi Kiran M , gammafunction , madhur , sidsen , varuns88 , svgreatest , Ananth , duriel , ali , Jean Valjean , aditya_s , Siddharth Jain , Prasad , Atul Mathew.

Goyal, username, Rc, shenoyvarun86, Priya, Rahulk, Vijay Shankar, K.Manish, Dibyo, Vivek, joe, Keerthi Kiran M, gammafunction, madhur, sidsen, varuns88, svgreatest, Ananth, duriel, ali, Jean Valjean, aditya_s, Siddharth Jain, Prasad and Atul Mathew