Lately large altcoin “pump and dump” groups have gained popularity. John McAfee has even been accused of giving pump signals via his Twitter! Discord pumping groups are very popular and invites are found all over Bitcointalk.org, crypto-related subreddits, and other forums are full of pump group Discord invites. Its a good idea to avoid participating in these since once you receive a “signal” the pump orchestrators have already set their sell orders. Most of these invites are sent out by people getting affiliate benefits in the group based on how many people they refer to the pump group (earlier access to signals). At best you may succeed occasionally but really you are just pumping up the price for the people running the pump so its best to avoid these.