Can you comment what you mean and i'll help
"A necklace of sweat" This is a metaphor because they are saying that she is sweating so much that sweat is all over her neck.
Answer:
Mob mentality is also known as herd mentality or pack mentality. It's a term used to describe how people adopt certain behaviors, such as buying a given item or following a trend, based on their social circle. This means that people described by this term can be influenced by their peers or can make choices in an attempt to show those of the group they belong to.
Now think of that, even if you have an iPhone or Android it can be used as an example of mob mentality. Or any trends, I'm sure you get it.
<em>good luck, i hope this helps :)</em>