Not sure that forum ignore and Facebook are really comparable. On a forum there is a conversation, and someone whose opinions you don't normally agree with or who raise too difficult points (because lets face it, these are the people who are most often labelled 'troll' around here) will often say something very relevant to the discussion. Ignoring them means you miss that, and lose the discussion at the point they entered it.
On Facebook you can simply hide posts from someone who posts irritating stuff and there's no threaded discussion to lose track of. I can't be arsed with all the fluffy 'pass this on and make someone happy' shit that one of my neices constantly bothered me with so I simply unfriended her. I really don't see how that is in anyway insulting. If she was putting some effort into her spam, it might be difficult to defend that, but in the circumstanced, unfriend seems right. She can always ask why if she even notices.
I really don't care what score someone got on Candy Crush.
I disagree there but perhaps I didn't explain it as clearly as I intended? I wouldn't put people on ignore simply because I rarely agree with what they have to say. It would be reserved for people who I felt simply say things consistently for effect and whom I feel don't add anything of value to the discussion (IMHO of course), therefore are excluded from the forum feed. If people ignored everybody that they didn't agree with, there would be little point having a discussion in the first place. That was not what I was suggesting. If somebody says something relevant then it will generally be commented on by others in the discussion so I don't think you miss it entirely, plus with ignore you can choose to view a post if you really want to. I tend to dip in and out of this place so miss the flow of most discussions anyway, but I am sure most people are not monitoring the forum on a constant basis.
My comparison with Facebook was relevant to my point because I felt it is a similar concept. If I am sick of seeing somebody moan, I have the option to hide them without deleting them completely. Games can be blocked in privacy settings and yes, seeing games scores is highly annoying for me too as I play no games on Facebook. You can hide such statuses in settings without hiding anything else that user might post which may be of use or interest. I don't generally delete people if I think I might see them in person either as I have had a couple of awkward situations in the past. I bumped into an old mate who I had deleted and it was one of the first things he asked. I had to lie and say it must have been a glitch before adding him again. This time I hid him so he would still appear on my list, but his content was hidden from me. Happy days. Although it seems silly, these trivial things can cause offence to some people who take Facebook too seriously. At least if you can ignore somebody discreetly, it caused less offence much like on this board. Anyway that's off topic but I thought it illustrated my point. If not, I know what I mean lol