9. A computer program product comprising a non-transitory computer readable storage medium having a computer readable program stored therein, wherein the computer readable program, when executed on a computing device, causes the computing device to: obtain question information identifying extracted features of an input question and a first source communication device that is a source of the input question; perform a clustering operation to cluster the input question with one or more other questions of a cluster based on a similarity of the extracted features of the input question to features of the one or more other questions; perform an operation based on results of the clustering of the input question with the one or more other questions, wherein the operation comprises automatically initiating a communication between the first source communication device and a second source communication device that is a source of another question in the cluster at least by one of automatically establishing a communication connection between the first source communication device and the second source communication device or automatically initiating a collaboration session, in a computer-implemented collaboration system, between the first source communication device and the second source communication device, wherein the input question is a question input to a Question and Answer (QA) system which processes the input question to generate an answer to the input question based on a corpus of information, and further generates one or more supporting evidence passages supporting the answer as being a correct answer for the input question; and generate, for the input question, one or more question (Q)-Answer (A)-evidence Passage (P) triplets, wherein performing the clustering operation comprises performing clustering on features of the one or more QAP triplets.
9. A computer program product comprising a non-transitory computer readable storage medium having a computer readable program stored therein, wherein the computer readable program, when executed on a computing device, causes the computing device to: obtain question information identifying extracted features of an input question and a first source communication device that is a source of the input question; perform a clustering operation to cluster the input question with one or more other questions of a cluster based on a similarity of the extracted features of the input question to features of the one or more other questions; perform an operation based on results of the clustering of the input question with the one or more other questions, wherein the operation comprises automatically initiating a communication between the first source communication device and a second source communication device that is a source of another question in the cluster at least by one of automatically establishing a communication connection between the first source communication device and the second source communication device or automatically initiating a collaboration session, in a computer-implemented collaboration system, between the first source communication device and the second source communication device, wherein the input question is a question input to a Question and Answer (QA) system which processes the input question to generate an answer to the input question based on a corpus of information, and further generates one or more supporting evidence passages supporting the answer as being a correct answer for the input question; and generate, for the input question, one or more question (Q)-Answer (A)-evidence Passage (P) triplets, wherein performing the clustering operation comprises performing clustering on features of the one or more QAP triplets. 12. The computer program product of claim 9 , wherein: the first source communication device and second source communication device are communication devices associated with users, the operation comprises sending a request to at least one of the first source communication device or the second source communication device requesting that the corresponding first source communication device or second source communication device join in a collaborative communication with the other source communication device via the collaborative communication system, and the collaborative communication is at least one of a chat group, an instant messaging session, an electronic mail exchange, or a conference telephone call.