Read Details/Facts Written By Others - Write Yours - Applaud Good Ones - Kick Bad Ones :)
Writing a Good Factoid is not as difficult as it sounds. Write facts around a narrow topic of interest - For example, History of the place, Driving Directions or Parking Help or some good natured suggestions to help others. Most important tip? - Make it read interesting. For Example, a useful heading can be - "Its One Way Road in front of the theater". And yes, do not forget to vote for your favourite writeups. Happy Writing!