Then came the glorious day when Argent Dawn went down. I still can't believe I did it, but I did -- I joined the players flooding onto Blackrock to create level 1 gnomes. (Bad player. Bad.) We delighted in tacking on RP-esque "-eth" suffixes to the most ridiculous-sounding names we could think of, and we dogpiled onto the bridges of Ironforge for a naked gnomish dance party, chanting "AD down! AD down!" (Not sure what that guy in the screenshot shouting about drugs was all about. Looks like we didn't even manage to keep our main chant going. Oh, well.) I don't guess we ended up accomplishing anything of note -- we didn't crash Blackrock like their players did ours so many times, nor did we really intend to -- but it sure felt good to return the annoyance for just that little while.
On a more serious note, WoW has been home to plenty of in-game marches, demonstrations, and protests of various sorts over the years. It was a very different era of customer relations back then, and many in-game protests were simply attempts to garner some attention from Blizzard over issues players felt strongly about. Today, of course, players enjoy much freer communication with Blizzard on the official forums, Blizzard blogs, and even Twitter and Facebook.
Have you ever protested or marched in game over a game-related issue? Did you feel it was effective? Do you post in feedback threads and interact with the Blizzard blues outside the game now?