How to say "你是托吗？"
比如这个人其实就是同伙，为了某种目的帮助其他人或事去推广或去烘托。在中文里面我们都说是，这个人是个“托”，但在英文中有没有相对应的名词去解释这种行为或是事。

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shill
astroturfing
astroturfer
Definitions of astroturfing on the Web:

Astroturfing is an English-language euphemism referring to political, advertising, or public relations campaigns that are formally planned by an ...
en.wikipedia.org/wiki/Astroturfing
The disguising of an orchestrated campaign as a spontaneous upwelling of public opinion
en.wiktionary.org/wiki/astroturfing
astroturfer - One who engages in astroturfing
en.wiktionary.org/wiki/astroturfer

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supportive

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'Capper'

or something like 'scammer' etc.