I'd just like to recognize Mursalin Habib's landmark achievement of being active in Brilliant.org or 100 days straight! I do not know if he is the first, or if others has done it already, because I do not have everyone friended, but regardless, it is still an achievement worth celebrating.
Good job Mursalin! I suggest following him; he creates some very good posts.
Runner up in my friends list is Vincent Huang with 94 days. Still 6 more days to go...
EDIT: Ammar Fathin Sabili I heard also has reached over 100 days in a row (thanks Cole Coupland). Congrats to him too!