1. A method for collecting and processing information of a target comprising a user of a communication network, comprising: obtaining a first identifier of the target, wherein the first identifier comprises a first domain and a first handle; identifying a first Internet site based on the first domain; accessing, in the first Internet site and based on the first handle, a first public webpage associated with the target; selecting a first parsing rule from a plurality of parsing rules that is associated with the first Internet site; extracting, by a central processing unit (CPU) of a computer, a second identifier from the first public webpage using the first parsing rule; determining, by the CPU and in response to extracting the second identifier, a similarity measure by comparing the second identifier to the first identifier using a pre-determined algorithm; determining, in response to the similarity measure exceeding a pre-determined threshold and without based on any prior association between the first identifier and the second identifier, that the first identifier and the second identifier identify the same person as the user of the communication network based on a pre-determined criterion; and collecting information of the target based on the second identifier for including in target data of the target.