I only post in groups and share from my business page. That would be terrible to get your shop closed from that, I have shared a couple posts to my personal page, but maybe I won't anymore!
Kathryn,
I am in a couple groups, one is "It's better homemade", Great group, I've gotten a few sales from that one.
The other group is "Etsy Fan Page Group", just a way to promote your items.
I usually only post once, maybe twice a week, that way I avoid spamming. I post to those groups generally when I have new items for sale and share my business page on the groups page.
It's been a crazy week, sorry it took so long for me to reply. Working on a custom order right now...