https://www.google.com/search?client=opera&q=rofl&sourceid=opera&ie=UTF-8&oe=UTF-8 it says clearly ROFL rix do ur research first Btw the pictures are good.
ROLF is just a variation of ROFL while ROLF means Rolling On Laughing Floor which in sense is like we are rolling over the floor which is laughing. So both are correct although one should state which one they are using to avoid soo many posts on one small acronym.