Don't the Mormons also practice shunning? There's another thread asking whether Mormonism could be a positive thing [I'm paraphrasing - lemme see if I can find a link after I've posted this comment], but since they practice a fairly active form of shunning, they aren't very different from the Watchtower Society.
Negative. The FLDS church practices shunning, but the LDS and RLDS churches do not. Unlike the Watchtower Society, the LDS "Mormon" church allows members to attend other churches, read other peoples' religious materials, read anti-Mormon literature and discuss critical topics on websites. The FLDS church, on the other hand, are forbidden to read critical materials, read outside news publications, watch television or listen to the radio, wear makeup, criticize the church, talk to outsiders, visit other churches and criticize the head of the church. A number of years ago, they adopted a "one man rule" policy which gave all authority to the leader of the church. He then excommunicated his enemies, closed down all recreation areas, took other mens' wives and awarded his friends other mens' wives. He also kicked out many of the young men so that the older men wouldn't have any competition when marrying 12-16 year old girls. They're an EVIL bunch.
The RLDS church has morphed into the Community of Christ, a very liberal group that has all but dropped Joseph Smith and the Book of Mormon in lieu of the touchy feely "Diversity" stuff many other churches are doing these days.
The LDS church does everything it can to keep from excommunicating or disfellowshipping members. It's pretty hard nosed on things like 1) murder; 2) pedophelia; 3) sexual abuse by those in authority; and 4) adultery. Also, if one speaks against the church or its leaders, which it regards as apostles and prophets. It has an apologetics group which is supported mostly by donations and is not controlled by the church. There is no sanctioned shunning anywhere in the church. In fact, shunning is actively discouraged.
CLDS Church of Jesus Christ of Latter-day Saints
FLDS Fundamentalist Church of Jesus Christ of Latter-day Saints (polygamous cult)
RLDS Reorganized Church of Jesus Christ of Latter-day Saints