Started by 1 and 2. People like 3,4 have “signed up” for it and 5 is the latest addition to the list. What are we talking about?

P.S: There is a question in-between the two pic-heavy posts.. In case you missed it

Cracked by: Goyal, mrsgollum, xeqtor, Manish Achuth, Moju21, Shwetha Maiya, aditthya, shrik, shrey, Darshan, raklodramA, Piyush, Amarendra, vinayaknp, Dibyo, SV, Thejas V R, joe, Rogi, Qbrain, Deepthi Nair, lanu, Rahul Rajeev, Logik, Raghuvansh, duriel, Sumanth Patlolla, apar, SS, v.chandrashekar, Bharath, mankuTimma, udupendra, dineshk, jowens, Pawankumar hegde, Bipin Banavalikar, Prasad, madhur, Siddarth Pai, Ananth, puneet_k, lotuseater, username, byslexia, stinky94, nishansolo, shenoyvarun86, Pranav Bajaj, vijayaraghavan, Anjul, uday, theJoker, Varun Ratnakar, Vishnu Prasad, pavan, Rahulk and Aparna