| CPC H04L 51/10 (2013.01) | 20 Claims |

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1. A method for question classification, the method comprising:
classifying, via a machine-learned model based on data from a person-centric space with respect to a user, a question from the user into a personal question or a non-personal question, wherein the person-centric space is constructed by cross-linking information relevant to the user from a public space, a semi-private space, and a private space, and wherein the data indicates whether the question comprises a sender of a private electronic communication sent to the user;
searching for an answer to the question in the person-centric space or in the public space depending on the classification of the question;
presenting the answer to the user; and
updating, based the answer, the person-centric space.
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