14. A system including memory and one or more processors operable to execute instructions stored in the memory, comprising instructions to: identify a message that is associated with two or more users, wherein the users include a sender and one or more recipients, and wherein the message includes one or more terms; determine a vague term of the terms, wherein the vague term includes a plurality of consecutive words, the consecutive words including at least a word and an additional word; determine that at least the word of the vague term is a reference to a given user of the users, the given user being the sender or one of the recipients; identify, based on determining that the word is a reference to the given user, a user-restricted database associated with the given user, wherein the user-restricted database includes content personal to the given user, and wherein access to the user-restricted database is limitable by the given user; determine, based on the user-restricted database, additional information that is related to the vague term, wherein the user-restricted database is used in determining the additional information that is related to the vague term based on the user-restricted database being associated with the given user and based on the given user being referenced by the word of the vague term; and provide the additional information to at least one of the users.
15. The system of claim 14 , wherein the instructions further include instructions to: identify an entity that is associated with the vague term, wherein the instructions to determine additional information include instructions to: determine, from the user-restricted database, a second entity that is related to the entity, and determine at least some of the additional information based on the second entity.