Sometimes a group starts out of their own and not even realize that there is already another group like it!!  It is not that they are imitating your group, it is just that they like their own circle of people and prefer to be with those who are more familiar.

You never know.  It could be a parallel universe!!haha  Well, let's just say that there are two mom and pop store down the street.  Both is in its own corner and does not bother one another.  One store has their own group of customers while the other also has their own!!

Challenge them to a team match; whoever loses has to change their group name! 

I have just had a look at this group, it was formed on 5th September 2011, so it has been operating for 2 days and has 7 members, the members I do not know but it has definitely copied our group.