I find some people do things to show others they are something which they truly not are but only in superficial side. For example, a newbie movie freak will start putting all the "top 50" movies of all time posters in his/her room to show others he/she is a big movie enthusiast but you can clearly see he has not done his own research.
Hope you understand. Please suggest a word to describe this behaviour.
In sports terms someone could be called a gloryhunter if he/she starts supporting already championship winning team without being a deep big fan.