Online Communities will help you leverage your Trade Routes to make the final push toward a Cultural Victory, causing each civilization to which you're sending a Trader to receive 50% more Tourism from you. If you manage to attract the Great Merchants Sarah Breedlove and Melitta Bentz, the 100% Tourism bonus you get from their abilities and this policy will put you on the fast track to cultural dominance.
Civilopedia entry Edit
Where “community” was once defined by place, now it is defined by common interests, common concerns, or cat videos. Virtual communities have proliferated with the expansion of the internet, notably via portable devices. Through chat rooms, forums, e-mail lists, and social networking services, many people now have thousands of “invisible friends” … along with, or instead of, the real ones next door. The trend towards belonging to an online community is spreading; as of 2013 AD, there were 20 major virtual communities with over 100 million members each.