Going along with the crowd (e. g., doing the ice bucket challenge, smoking pot, polar plunging) because of a fear of social exclusion is an example of

Going along with the crowd because of a fear of social exclusion is an example of 'normative social influence'.

Explanation:

The fear of social exclusion is what most youths fall prey to. Due to the fear of this exclusion, they take-up challenges prevalent on various social media platforms and do unhealthy things that have the potential to harm the performer permanently.

The inability to complete these challenges often brings an inferiority complex in the ones failing to do it.

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answer; ratification;