Yes, it does exist, and not only in the Mormon Church.
‘Biblical Families’ has one such website, discussing all aspects of family life, including families with multiple wives: (in a Christian community)
http://www.biblicalfamilies.org/forum/?bfpage=forum
and on twitter: https://twitter.com/biblicalfamily
Categories: Americas, United States
Hello and GOD BLESS you all.
Many Christians believe in Polygamy Blessed by GOD,
as with in GOD’S HOLY WORD tells us many had more then one wife.
May GOD BLESS you Forever,
Rev.Mark Alan Pendergraft