What is auto tweet to a new followers? When you follow someone on Twitter, the user you followed sends tweet mentioning you and thanking for the follow.
When someone mentioned you, you mostlikely OK with that as it exposes you to many followers. But what about his followers who see similar tweet over and over thanking others for the follow. I personaly in this case simply unfollow, I don't need junk in my timeline. And I'm sure many others will do the same.
This kind of approach forces real followers, who is actually reading your tweets, to unfollow you.
We discourage you from using the auto tweet new followers.
Instead you can use Twitter Auto DM to welcome your new followers privately.