I think that is the plurk privacy & options... you can choose them to plurk. Let me try...

you can use the plurk & privacy options to send them a private plurk

Ah, gotcha. So many things to learn.

Ooooo, I want to be plurked privately. (Couldn't help myself.)

Bwahahaha. Who doesn't?

HI! Nice to see you are as much fun here as you are on twitter