Wikipedia lists a number of different Chabad groups including:
I was told that these different groups were all formed when the sons of the Tzemach Tzedek created their own Chasidic groups. But today, I only see Chabad-Lubavitch. Are there members of the other groups still around? Or did they just merge? Or fizzle out?
Also, the Lubavitch sub-group of Chabad doesn't seem to refer to the other groups (e.g. in the family lineages I've seen in their printed seforim it only lists one son of the Tzemach-Tzedek when showing a `direct line' though the generations) -- is there a reason for that? Are there still hard feelings over the split?