The GCTools are professional networking and collaborative platforms. Collaboration is based on trust and we should all be easily identifiable. Don’t forget that your user profile is linked to your email address, and that your full user name (usually RealFirstName.RealLastName) appears anyway in the address bar; Therefore, there is no point in trying to hide behind a screen name.
When you register, you have to accept the Terms and Conditions. Using your real name is part of the conditions you agree to when signing-up.