Since the Chief Architect is so supportive of privacy rights - I'd like to participate in G+ using a pseudonym. How about it Google??
You only have to prove people know you by a name if you want to go by "#RS", "Albert Einstein", or "GreenLife Rx"; all three of those are likely name violations for reasons that have absolutely nothing to do with knowing who you are.
Unless, of course, you are someone who actually needs a pseudonym even to ask such a question, in which case such a forum is not for you...