Crush is a type of Crowd. Crowd is related to Interesting. Interesting is related to Exciting. Learning can be Exciting. 
Contribution is a synonym of Share. Shared is a form of Share. 
Crush --IsA--> Crowd <--RelatedTo--> Interesting <--RelatedTo--> Exciting <--HasProperty-- Learning 
Contribution <--Synonym--> Share <--FormOf-- Shared 