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So contrary to what you say, the practice of having "alts" is pretty much encouraged.
I don't think you can use the same email on multiple accounts at the same time, but using address extensions or creating new emails is easy.
You're running a one-person troll farm? Please reconsider your choices in life.
Or a small business, but I wonder how much money there is in that.
how else do journalists write this articles on internet hate mobs?
Recently, I have used these accounts to get answers to questions: post the question with one account and ~3 bad but assertive answers with other accounts, and that's usually enough to get at least one response from someone who knows the right answer and wants to prove they are smart. All of this can now be done very easily by ChatGPT, too - it used to take effort.
This is the "dark" part of social media marketing that nobody talks about but a lot of people engage in.