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Only a hipster snowflake's magazine could put such question in a headline.

A crowd is a major hardwired social heuristic. When someone sees a crowd of protestors or supporters almost automatic mental processes of estimating it's size and more importantly of taking a side wether one is with it or against it are triggered. It also forms a emotionally charged long lasting memory - a hostile crowd is a major life threat. Crowd of supporters is associated with protection and change. This is freshman's social psychology 101.

Number of likes, BTW, and numbers related to social events in general works in the same way. Social heuristics are hardwired and hence easily exploited by media or sales departments. The best strategy is to convince a potential buyer that there is a presumed crowd of enthusiastic buyers behind him. Tesla is the obviously example.

Crowd of protesters is a major concern even for Trump.