Please note that on July 2nd, 2013, Twitter changed their terms of service and banned automated following back of people who followed you first.
There’s a discussion about it here.
Unfortunately we need to comply with Twitter’s new rules so we have removed the feature from Pluggio.
As of July 14th auto-follow-back will no longer work on Pluggio.
However, auto welcome messages will continue to be unaffected.
If Twitter ever decide to again allow auto-follow-back, we will of course switch it back on.