The Group Catalyst

 The world has many people, therefore there are many groups of people as well. Each person has so many characteristics that it is impossible to not share some of them with other people. The natural tendency humans have to associate themselves with people who have common characteristics used to be barred by the difficulty of finding such people. For example there may be a duct tape enthusiast in California and one in South Africa, but up until recently there was no way for them to collaborate and share ideas. With the social media revolution, it is now easy for anyone with access to the internet to join groups of people with the same interests. With the duct tape enthusiast example (which was randomly selected without any prior knowledge to any duct tape groups) any tape artisan can simple google "duct tape forum" and find a place to discuss their craftsmanship. With the cost of forming groups lowered nearly to zero, people can communicate and associate with unprecedented ease.