Go to your Admin Console and type the following:
Do the same for these:
Apparently these people are commenting with spoilers on unsuspecting journals, so if you fear being spoiled, banning them from commenting is a good option. Of course, if you want spoilers, I suppose you could friend them?
If you run an HP community (or a community with a large number of HP fans) and want to prevent them from being spoiled, put this in the Admin Console:
ban_set wasteofpages from communitynamehere
Repost or link to this if you are so inclined.