12. A system comprising: a first community question-answer (CQA) server configured for communication with a plurality of client computers via a network, wherein the first CQA server is further configured to: obtain a plurality of first questions and corresponding first answers as a plurality of first question-answer (q-a) pairs; select a second question and a plurality of candidate second answers received from the client computers as a plurality of candidate second question-answer (q-a) pairs for determination of a best answer to the second question; identify a set of the first questions that are similar to the second question; determine first linking features between the identified set of first questions and the corresponding first answers; determine second linking features between the second question and each of the second candidate answers; and predict a likelihood of analogous linking features between the first linking features and the second linking features for selecting a best answer to the second question from the candidate second answers.
12. A system comprising: a first community question-answer (CQA) server configured for communication with a plurality of client computers via a network, wherein the first CQA server is further configured to: obtain a plurality of first questions and corresponding first answers as a plurality of first question-answer (q-a) pairs; select a second question and a plurality of candidate second answers received from the client computers as a plurality of candidate second question-answer (q-a) pairs for determination of a best answer to the second question; identify a set of the first questions that are similar to the second question; determine first linking features between the identified set of first questions and the corresponding first answers; determine second linking features between the second question and each of the second candidate answers; and predict a likelihood of analogous linking features between the first linking features and the second linking features for selecting a best answer to the second question from the candidate second answers. 17. The system according to claim 12 , wherein the first CQA server is further configured to collect both positive first q-a pairs containing a first answer previously identified as a high-quality answer, and negative first q-a pairs containing a first answer that is not a high-quality answer when obtaining the first q-a pairs.