We all know that Google is always developing great applications and services for Internet like Gmail, Google Docs and many more services , but have you ever think about the Gmail contacts in your Gmail Account. When ever you send an email, get an email, reply to an email or forward an email all the contacts that are not in your contact list will automatically added to your Gmail contact list. So your contact in Gmail is not your contacts these are the Google contacts that has been automatically added by Gmail to your contact list. You can disable this feature in Gmail Settings and in Google Talk but most people don’t do.So likely in your Gmail contact list there are a lot of people them you even don’t know.

There are some rules according to a person is added to your Gtalk or Gmail Address Book

Rule #1:
"if you reply to someone’s email, that person is added to your Gmail contact list.
(Error #1: you may not know that person) "

Rule #2 (opt-out):
"if you reply to someone’s messages more than 2-3 times, that person is added to the list of Google Talk friends.
(Error #2: see error #1. Also that person may not be your friend.)"

Above rules are taken from Google Blog

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