Zandranna, it's not so much that I want to keep the fact that I gave someone a kudo a secret as much as that I don't always have a comment, per se. See, anyone who posts on my board for a couple of weeks is automatically "rewarded" or "thanked" with a kudo from me. I don't necessarily want for it to show up in folks' comments sections with a comment from me that I gave them a kudo, or why, because then people reading those comments might misinterpret my intention as my trying to advertise my board on people's profiles, when actually my intention is simply to "reward" or "thank" the newbies for becoming a new member of my board. And besides, there is a link to click to find out who gave us our kudos.

he looks like he's holding his breath
Yes, I like that one! Very clever.
and