to block a person without them knowing

I don't think so. But they're can't really do anything about it besides block you back.

... I don't believe so. But they'll find out anyways when they can't see your profile anymore, so there's not much need for hiding it.

thank you. @ janet @ Disturbance and lock it away please :D

i just thought i'd add, the reason you can't do this is becuase its against the rules to contact someone (among other related things) someone who has blocked you, so everyone needs to be informed if they are blocked. and i'll continue on with the locking now :)