I had contributed to various articles as I get time.
But I have recently came across the Wiki Mafia. The attacks on my work for Sydney Hilton bombing were quite vicious.
It is normally quite fun interacting with others to produce a solid article. But that requires some sensitivity to the views of others. On the other hand, the Wiki Mafia just deleted well researched contributions, with no added contribution of their own, nor any attempt at reconcilliation. Their argument was simple: "our clique is bigger and more established than your clique".
Wikipedia is not worth the angst, so I have left. The Hilton Bombing article can be found at [1].
(And the long saga of the Wikipedia article can be found [2].)