Dreaming about unkown people?

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I been having some dreams about people that i do not know, have not yet seen or met. I am just wondering what might these dreams mean. Would you meet them in your life time, or they are just a personification of who you are. I am just want to know more about this, and hear from others.. Maybe its deja vu.. How about you? Have you ever dream about persons you do not know?