He explained the steps needed to be taken in the blog one by one. The users can tag 1000 images in one Facebook Note or the same image can be tagged a 1000 times. Suppose each image is at least 1 Mb and if 100 users try to see the note at the same time then the amount of parallel requests for Facebook servers is already huge that is 1 * 100 * 1000 = 100,000 Mb or 97.65 Gb. This can become even bigger if the image file is replaced with some other file of larger size. For example, Thapa used PDF file of 13 Mb and demonstrated that the impact can be huge. He found similar issues with Google also which means that the method can be easily replicated to other services. After reporting the issue to Facebook, Thapa got a reply from them telling him that they will not fix it. Facebook wrote: Thapa criticized Facebook for not taking it seriously. He wrote: Read More about it on Thapa’s Blog
