I'm part of a very big group of traders, or should I say a set of traders coming in different categories - from small sized traders to big giant whales and there's literally no pump-and-dump supported therein - it's Blockchain Whispers Baby. Founder of BW, D Man posts some of the most knowledgeable content in his articles as well as their telegram and you can learn a lot instead of just hearing out for those signals whereas most of the groups just share signals and in reasons, they just give the specified coins' events (news) that are going to happen. Give this website a read and I'm damn sure you won't leave without buying their premium (if your portfolio is above 1 BTC), else checking some of the most accurate Bitmex signals on their signal page (navigate through website's menu) and watch for the articles as there are many hidden signals as well.