In Mensa we have lots of Facebook. After all Facebook has the same number of users as the population of China. In our local group we have NNJ Mensa and NNJ Mensa youth. Here are the links- https://www.facebook.com/groups/northernnjmensa/
American Mensa also has a Facebook account at https://www.facebook.com/AmericanMensa/
Northern New Jersey Mensa 