troll factory: an organization set up in order to publish a large number of messages or posts on the internet, that often appear to be from people who do not really exist, and that are intended to cause trouble, influence political views, etc. ~ Cambridge University Press.

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sock puppet: a false online identity used for deceptive purposes.  ~ Merriam-Webster

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troll: a person who intentionally antagonizes others online by posting inflammatory, irrelevant, or offensive comments or other disruptive content.  ~ Merriam-Webster, Incorporated.

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disinformation: false information deliberately and often covertly spread (as by the planting of rumors) in order to influence public opinion or obscure the truth.  ~ Merriam-Webster

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misinformation:  false information that is spread, regardless of whether there is intent to mislead. ~ Dictionary  com, LLC