The two biggest sites in the social networking world, Linkedin and Friendster, not only offered ways to join groups and engage in discussions, but also asked members to provide names of friends to invite to the site. This enabled users to use the site to interact with friends they already had, resulting in an increase in memberships and sparking a new boom in the growth of social networking sites.
當時美國兩個新興的社群網站「Linkedin」和「Friendster」，要求會員除了加入討論群組外，也必須提供「我有哪些好友」的名單，讓會員彼此間的好友能互相交流，擴大群體規模，社群網站也因此逐漸蓬勃。