1. A method of data acquisition, said method comprising: downloading a user's sent materials from a communication data repository; analyzing the sent materials and extracting data portions that are authored by the user; generating statistical values from the extracted data; transmitting the generated statistical values to one or multiple repositories; receiving the generated statistical values on one or multiple server machines; and aggregating statistical values of multiple users, wherein said aggregating statistical values of multiple users comprises inferring personal expertise of each user who transmits the generated statistical values from the user's extracted data.