It seems Zac Efron has an addiction. A selfie addiction. 

When a movie is filming there is a photographer on set at all times to capture all of the special moments from behind the scenes. So in theory Efron would never need to take a selfie. However whenever the Baywatch star does something he always gives 110%. Once he got a hold of a selfie stick while on the set of his new movie Mike and Dave Need Wedding Dates he made sure to capture every moment so that they'd have that forever. 

Via Youtube