End of the day everything is competing for your time. So in a way facebook, snapchat, twitter, email, tv, radio, etc are all really competing to occupy whatever

End of the day everything is competing for your time. So in a way facebook, snapchat, twitter, email, tv, radio, etc are all really competing to occupy whatever free time you have available when you are not sleeping. If the core joy provided by the service is of high enough value to a large enough number of users then that service will win.