Sociability in Q&A communities is the amount of messages posted that correspond to some sort of social interactions such as a "hello/goodbye" "thank you", personal anecdotes, or personal reference to another participant when writing the message.

When someone is sociable, but not high in knowledge contribution or social capital, emergence as a leader is not significant. I.e, it is not a significant predictor of being recognized as a leader by the other participants of the community.