It is not essential that you add profile information, other than the basic sign up information when you register (name, email, gender, date of birth and postcode).
But you will find that you may not receive as many survey invitations, or as many relevant survey invitations if you don't complete your profile. The profile page also lets you specify how many surveys you want to receive.
Is my data safe?
Yes, we do not share your personal data and profile with third parties - it is only collected to help us target members for surveys.