Hey, that's handy

It's been so long since I added a new "friend" on LJ that I hadn't noticed this before on the "add this person" settings page:

All entries can be read by default or you can personalize your feed to include/exclude posts tagged with specific words or phrases.

So, someone who doesn't want to read posts about diets (for example) can exclude any of $friend's posts using that tag from showing up on their feed? I can't think of anything offhand that I might specifically exclude, but it's good to know it's there if I want it.