Quora has a pretty good system that virtually eliminates trolls. Although it's not the whole system, allowing downvoting of threads which eventually get's a response collapsed and requiring an extra click to open it would go some way toward filtering obnoxiousness. One of the problems with putting someone on ignore is that we have some characters here who are obnoxious but do have some useful insights. It would be nice to have a way for the community to filter them only when they're being obnoxious. Collapsing threads is a good way to do it because the info isn't banned or removed, it's just minimized.
