1. A computer program product comprising: a non-transitory computer readable storage medium; and computer usable code stored on the non-transitory computer readable storage medium, where, if executed by a processor, the computer usable code causes a computer to: determine a user-question affinity value between a user and a question based on one or more user metrics and one or more question metrics, wherein the user-question affinity value is to indicate an extent of affinity between the user and the question; determine a user-community affinity value between the user and each of a plurality of candidate social communities based on at least one of the one or more user metrics and one or more community metrics, wherein the user-community affinity value is to indicate an extent of affinity between the user and each of the plurality of candidate social communities, and wherein at least one of the plurality of candidate social communities includes a pre-existing online social community having a candidate member that is to proactively establish a relationship with another candidate member and is to form a group of candidate members that are to interact with each other; and determine a question-community affinity value between the question and each of the plurality of candidate social communities based on the user-question affinity value and the user-community affinity value to identify one or more relevant social communities for the question, wherein the question-community affinity value is to indicate an extent of affinity between the question and each of the plurality of candidate social communities, and wherein the question is to be routed to one or more of the relevant social communities based on the question-community affinity value and is to be available to each member of the group of candidate members to respond to the question when it is determined that the pre-existing online social community is to be one of the one or more relevant social communities.