Along these lines, how have Hubski's moderation tools served you if you have employed them?
I have people (who are extremely racist or have posted in support of violence to silence feminists) muted and filtered, since I really don't want to see them. I often find their digital droppings when checking out other users' feeds (I check before I decide to follow/filter/mute people) though. I also have several spammers muted and filtered, as well as tinyurl.com which has only ever been used on hubski by an accounthopping spammer. I've also filtered hate site and political FUD domains that I've come across in global.
It's far less prevalent here than it is in other sites. This makes it all the more jarring and visible when it does crop up though. Glad you've not experienced it.