There have been a vast number of online challenges, popping up and then disappearing as fast as they arrived. Some are harmless fun. Here is link to some of the more popular harmless online challenges for 2018. The challenges are popular with those who have their own YouTube channels. The challenge can often be used as a means to attract more subscribers. Many can ask their fans, or followers to suggest a challenge, for the channel host to perform. However, there are others which can have tragic and sometimes fatal consequences, for those who take part.