This site (thelayff.com) is ok for employees of various companies to come to and complain, but how much exposures does their message receive outside of this site? I would guess not much. "Watching IBM" on FaceBook is an alternative but you must go through a moderator if you want to remain anonymous otherwise you must use your real name.
Twitter seems to be an ideal platform with broad exposure. Start a #hagtag conversation, tweet and retweet it to the many media outlets, watchdog groups and government agencies that are on twitter.