Am I who I am?

I was sitting in on a webinar on Social Media the other day when the presenter said “You are not who you say you are – you are who Google says you are”. It reminded me of the poem – “I am not I” by Jimenez- who says he is something larger than himself. Is that true for us? If we are not who we say we are then who are we? Are we only the people who we see ourselves as or the person that other people see ? In this electronic age is there no us except as we are seen by Google?