Are matrimonial sir safe to choose our life partner? how you will choose ?

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Hi, my friend has decided to search her life partner on matrimonial site. She want to know that person personally and then going to decide, her parents are against it. And i dont know what to tell her as i have not registered myself any where. Does any one of you have registered and got marreid through matrimonial site? Are matrimonial site safe? What we should refer before taking any decision? please help as its going to effect her life.