The Law Society has a rule that a lawyer cannot provide legal advice to a client without knowing the client's name, address, phone number and occupation [ By-Law 7.1, Part III: Client Identification and Verification]. As well, I must know if you are over 18 years of age for legal competency issues. Identification is also necessary to avoid the rare conflict of interest situation arising, ie. where I may already be advising other parties involved in your case.
In the internet age people are understandably anxious about giving out personal information, but rest assured that if you give me such information it is only used for identification, it is not sent to the Law Society and it remains confidential with me - even if you do not hire me. If it makes you feel more secure, you can confirm my status as a licensed and practicing Ontario lawyer through the Law Society of Upper Canada's website:
Law Society of Upper Canada Lawyer Directory
(just type in my name: "Simon Shields")