It has been around for quite a while but seems many are still not aware of it.
Basically, it let's you exchange votes with other steemians.
You choose voting limit and authorize the app via posting key and it will automatically work for you.
Your account will automatically upvote other vote club members content and they will automatically upvote yours.
How Voting Works! Steem-Bounty Vote Club
It's highly useful if you are someone who posts content regularly, and I doubt this would be frowned upon under #newsteem as this is just automatic way of circlejerking.