Quite some time ago, when Friendster was still a thing, the founder released a statement saying that they found having five friends was critical to keeping a user active. This meant that if a new user was unable to make at least five connections, the likelihood of them sticking around for more than the first week was dramatically reduced. What Friendster did was integrate a “Find your Facebook Friends” flow as part of their onboarding experience. Users were encouraged to use their Facebook login to sign in and then the system would find other Facebook friends using Friendster. The app would ask if they wanted to make theses same connections in Friendster. This was an easy way for them to reach that five person threshold that made user retention so successful.