What makes a facebook group viral? I know there are lots of factors involved, but there are so many groups out there that have hundreds of thousands of members, so what separates one vs. the next, here are some thoughts of mine, let me know what you all think. I have heard that the chain letter style (i.e. invite 20+ of your friends for this to work) of group works well, but I've yet to experience that myself. I've taken a few groups to 500-1000 members with my initial pushes, only to see them quickly die off. My thoughts are that a. the group of people that i'm sending the group invite to are not doing so themselves, b. the group of people that are receiving the second level invites aren't opening them enough, or they aren't compelled enough by the group to continue the trend themselves. What is everyone elses take on what makes these things a success? How many initial members are needed to see if one can even be successful? etc. Is a page or a group better for viral growth?