Does anyone know how to do the following:

1) Set a default time zone, so that when a new user is invited it can default to the office time zone instead of making users pick from the huge list.

2) Customize the User Profile, so that when invited users join and create their password, they don't see the "Twitter" and "Facebook" fields. This is completely irrelevant in our company and looks unprofessional / confusing that we even have the fields listed.

Thanks!