• In your class need to be at least 20 People
• Each class member must create a new account on steemit ( The account must be created after 17 January 2018 ( one exception allowed if you already had an account)
• Each class member must make at least one post on Steemit and use the tag #classroomchallenge
• Resteem this post
• Your own class members must follow each other.
  [ changed below rules to make it more clear]
• Each class member make a post on Facebook or Instagram that you are competing in this challenge.
• Each class member reply on this post with the Facebook or Instagram post(link) and do a resteem.

I made some clarification about this rules. The intention is to have a big visibility for this challenge and to have more and more Steemit promotion.