I use it a lot.
I’m in a number of sharing groups on there where we post your url of one of our items and other’s in the group will then click the plus one or click the share icon and add a comment. The more people +1 and share you post the more people see your post.
Also posting on there helps get your item further up in a google search.
You’ll get people following you and you can follow other people.
You can do chattie type posts if you wish.
Some groups don’t like you posting from your shop other’s want you to post from your shop, you just have to decide which groups you’d like to join in with. Read their posting rules.
The folksy group hasn’t got any rules posted and people don’t do a lot of sharing and +1’s but whenever I post an item from my shop in there I make sure +1 or share with comments other folksy peoples posts.