its very hard to know...sometimes u just have to watch the trend both tecnical and funamental analysis also join pump and dump groups
As I know, the majority of pump/dump groups are fraud. They give you info right before the action, and the price go high for several seconds. You place buy order, and you find you out, that you bought the coin on a peak. And after that - yes - DUMP! So, the only users, who win from the pump and dump - group owners. There are many videos on youtube concerning this topic.