5. A method for determining if an author of a social media interaction is one of a plurality of customers for whom identification information is registered, the method comprising: receiving identification information registered by the author of the social media interaction that is publicly available, wherein the author's received identification information includes a channel-specific identifier associated with a social media channel and the identification information registered for the plurality of customers includes a channel-specific identifier associated with a different communication channel; and determining a final equivalence of whether the author of the social media interaction is one of the plurality of customers using an equivalence relationship comparing the author's and customer's respective identification information and content information describing the content of the author's social media interaction and content information describing the content of the customer's past interactions, wherein a predetermined threshold is set to define a range for the equivalence relationship within which the author and the customer are determined to have the same identity, wherein the predetermined threshold is set in a testing phase to balance maximizing the accuracy and minimizing missed instances of determining authors and customers to be identical that are previously known to be identical, wherein each of the author's and customer's information is represented by a vector with each of the identification information and content information thereof having values in a respective dimension and wherein the author's and customer's information are compared by calculating the vector difference between their representative vectors to measure a similarity between the author's and customer's information and wherein the content information is selected from the group consisting of: linguistic richness, sentiment, tone, opinion, style, vocabulary, average length of sentences, slang and emoticons; and after determining the final equivalence that the author of the social media interaction is the associated one of the plurality of customers, monitoring that author's social media interactions by the contact center for the associated customer.
5. A method for determining if an author of a social media interaction is one of a plurality of customers for whom identification information is registered, the method comprising: receiving identification information registered by the author of the social media interaction that is publicly available, wherein the author's received identification information includes a channel-specific identifier associated with a social media channel and the identification information registered for the plurality of customers includes a channel-specific identifier associated with a different communication channel; and determining a final equivalence of whether the author of the social media interaction is one of the plurality of customers using an equivalence relationship comparing the author's and customer's respective identification information and content information describing the content of the author's social media interaction and content information describing the content of the customer's past interactions, wherein a predetermined threshold is set to define a range for the equivalence relationship within which the author and the customer are determined to have the same identity, wherein the predetermined threshold is set in a testing phase to balance maximizing the accuracy and minimizing missed instances of determining authors and customers to be identical that are previously known to be identical, wherein each of the author's and customer's information is represented by a vector with each of the identification information and content information thereof having values in a respective dimension and wherein the author's and customer's information are compared by calculating the vector difference between their representative vectors to measure a similarity between the author's and customer's information and wherein the content information is selected from the group consisting of: linguistic richness, sentiment, tone, opinion, style, vocabulary, average length of sentences, slang and emoticons; and after determining the final equivalence that the author of the social media interaction is the associated one of the plurality of customers, monitoring that author's social media interactions by the contact center for the associated customer. 21. The method of claim 5 , wherein the equivalence relationship defines a fuzzy comparison between the respective identification parameters and content parameters of the author and customer to determine whether or not the author and customer match.