Answer:
Go and click on the invitation bar and you can find an option written as " search friends ". Then it's easy to find that unknown user if you're pretty fond of his/her username and DP ( display picture ).
Explanation:
i asked a friend and we came up with this answer i don't know if it's right I've never tried to look up someone so try it out and see if it works if not ill try again
Its C. Significant world event.
Message .d. need any other help with english just ring a bell
A. Genghis khan's name was Temujin, which translates to "made of iron"
