I've been here for years and I still don't get all of the terminology. I use the ping to give myself articles for later reading. You can see your pings on the link on the top of the screen. I use the bump to send an article for someone else (put their name in the To: field). I am sure the PTBs will say I have it all wrong.
I was going to tell you that you got it backwards but I realized I don't know what a PBT is so I'll just shut up.