President Obama's tweet about being reelected was retweeted by thousands of twitter users within minutes. This is an example of what kind of diffusion? relocation

hierarchical

hearth

contagious

Hierarchical  diffusion

Explanation:

Hierarchical diffusion describes a situation where information is first shared amongst certain people such as a group of connected individuals and then those ones spread it as well to others.

This is what happened here. President Obama's tweet was first seen by people who followed him and so were connected to him on Twitter and then as they retweeted it, more people saw it and retweeted it as well leading to the tweet being shared to millions.

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