FOMO, FUD, and BTFD, it is all creation of the market, and best use case is non other than Social Media.
Take example of Elon, how he manipulated Doge's price to later integrate it to his own company. These people like Elon, exchanges, new platforms, twitter, medium, reddit, etc are all involved and support each other to spread greed and fear.
Everything is a manipulation of some sort - some are better than others though.