Being noob and just trading based on few people you saw on twitter is the biggest reason. In my nation (I do not know about other nations) there are people on social media that give advises on which coin to buy, most of those people share charts and indicators on what will go up or go down, where to buy and where to sell.
Some of them are really good and they make profit more often than not, if they give numbers on at what price to buy and what price to sell, 8 out of 10 times they are right, and sure those 2 loses you money but you make more profit in those 8. However what people do not know is that it is the people that cause this, they give names and those followers go ahead and buy that coin/token and increase it and that is why they are almost always right, these people get paid by projects to promote them, and the group just pumps it and thinks the influencer as smart person.
It's true that the reason for twitter has become based on what they know what to buy and where to sell it, even this kind of thing is still widely followed, only twitter is the most active, people always give an idea about the coins that will be pumped normally while include the graphics they made, sometimes noob likes to follow in their footsteps.
In essence, never depend on other people, we must be part of us about the right decisions when to buy to make money, if we only rely on TG, of course it will be used as ammunition to manipulate the future market. it will be pumped and then dumped badly because they dumped it.