There is is an option to create profile from account immediately, which would make the site work like any other. Yet, we now have a few custom sites that rely heavily on ability to choose multiple profile types after joining - i.e. patient/caretaker/nurse/doctor/hospital or student/parent/teacher/faculty, etc. not just roles but completely different ‘personas’. It’s definitely not for a typical social network, but it makes a great difference for more specialised sites.