Hi there. 

Here you have a good article. It's a recommended lecture if you want to understand those pump-dump waves:

http://uk.businessinsider.com/how-traders-pump-and-dump-cryptocurrencies-2017-11/#pump-and-dump-scams-are-coordinated-through-groups-and-channels-on-the-app-and-advertised-in-advance-2

Any opinions about this?