Oh. Eye-opener. Is this why in the past year or two random contacts are doubled, tripled, quadrupled, and I can't merge them, and sometimes one app (like Hangou

Oh. Eye-opener. Is this why in the past year or two random contacts are doubled, tripled, quadrupled, and I can't merge them, and sometimes one app (like Hangouts/messaging) won't know a phone number is attached to a contact while another (the phone app) will, etc? The contacts in Android seem totally fubar lately. Knowing it's due to the G+ POS clears things up a bit.