Online friends in social networking sites ..go ahead and see

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A latest study of researchers says that making online friends in many of the social networking sites such as orkut , face book ,twitter ect is allowed to shrink to world . but our brain can remember only 150 of your friends no matter how many friends you have and how many are really close to you. What do you say about this research , do you have friends list above 150 or limit them to certain numbers..