Holly Elliott said
4 months, 2 weeks ago: @rich-brooks, I too have been trying to work on the etiquette end of Pinterest. I have three Pinterest pages – two formal business pages (one for my antiques biz, one for the jewelry side) and one personal page.
I’m still getting my antiques page set up and migrated from what was originally set up as a personal page, and am working toward having my business pages focus on the things I sell or related subjects; my personal page reflects more about me, my personal interests, etc.
What I’ve been doing with the jewelry page (and intend to do with the other business page, once I get it more together) is: Anytime someone follows my page or a board, or likes or repins one of my pins, I go to their page in search of their jewelry- or fashion-related board and browse there. Once I find something that is eye-catching, I will repin one of their pins to either my “For the love of old jewels” or one of the fashion-related boards. So far, I’ve been able to find something that fits in. This way, I can sorta keep track of who’s given us a little bit of love, and let them know that I noticed.
I’ve also, on a couple of occasions, added a “Thanks!”-type comment to an item that was pinned on someone else’s board. In one instance, the person apparently removed the comment; guess it felt a bit too much like a peeping tom or something. 
One of my followers has a board devoted to their favorite pinners. I thought that was a cool idea, but … well, I’m afraid I’d look too much like a copycat if I were to do the same.