Every thing Mcaffee mentions gets pumped and then usually dumped. Why are people this stupid? He has made himself a prophet in the cryptosphere and is using it for making profits.
He mentions coin of the week and it grows by 20% in minutes.
Not only for pump and dump but also for ICOs too and the result is amazing though, everytime he tweets about an ICO, the project will have many investor soon and many people invested on that project. I actually use the tactic by following what is mcaffee said, if "A" coin will pumped soon, i will buy some and sell it when i get profit, if you late you will lose money.