BH, I'm the same as Joseph in this regard, I never unfriended XW or any of her relatives after BD and in fact am still "friends" with them all these years later. None of them are very active on FB though. I just found out a few days ago (via a big fight) that my GF has been harboring a lot of resentment because every once in a while XW will post something (like pictures of her and our kids on vacation) and I will "like" or comment on it, but that's another story (rolls eyes).
I think unfriending everyone out the blue might come off as angry and vindictive, but at the end of the day it's all about doing what YOU need for YOU. So if it's hurting you to see them post stuff, or if they are posting nasty stuff about you that rubs you the wrong way, then go ahead and unfriend them.
