I think you're right about this. Primal is always the go-to app for most I meet at the @Central Pennsylvania Bitcoiners meetup. It's easy to get started because everything looks "clean". The built-in wallet is an incentive as well. The fact that Primal also has a web client at Primal.net also makes it feel like like an actual competitor to Facebook, Twitter, etc. Unfortunately, the app itself always seems to have problems when you need it to work. Primal just seems to care more about form over function to me. It's that beautiful woman that you still would never marry.