The traditional model of psychological factors behind leaks is called MICE. Each letter describes a potential reason why one would leak secret information. M stands for money, I stands for ideology, C stands for coercion, and E stands for ego or excitement.
I believe this last one, the E covers what you are talking about. People who know something special can share it and thus appear in the specific circumstanc as special themselves. This strokes their ego which motivates them to share more.
I believe this last one, the E covers what you are talking about. People who know something special can share it and thus appear in the specific circumstanc as special themselves. This strokes their ego which motivates them to share more.